Malicious PDF — malware analysis report

Static analysis result for SHA-256 659bc0acd04491d0…

MALICIOUS

PDF

99.9 KB Created: 2021-04-07 06:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9395fcb1f9ad2852c7a257e4039ac65d SHA-1: 34643b545c1cc93bf119763e2d4c91214ffa4100 SHA-256: 659bc0acd04491d082f4f9cb3725d9183912bc84f6309754be99f5e54a13de1b
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document functions as a link farm, directing users to various external PDF files hosted on disposable domains. The primary intent appears to be credential phishing, as indicated by the 'SE_BRAND_CREDENTIAL_PHISH' heuristic which identified a 'Bank Of America' impersonation lure. The numerous external links, many hosted on Weebly and other similar platforms, suggest an attempt to obscure the final malicious destination and potentially evade detection. No scripts were extracted, but the structure and heuristics strongly indicate a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://masudokunu.weebly.com/uploads/1/3/4/7/134731157/luwirisewip.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/wix?keyword=gatsby+short+answer+study+guide PDF link annotation
    • https://masudokunu.weebly.com/uploads/1/3/4/7/134731157/luwirisewip.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/solifa.pdfIn PDF document text
    • https://kajukuka.weebly.com/uploads/1/3/4/3/134307777/5626311.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/jridgfY/sheet_music_line_names.pdfIn PDF document text
    • https://mikudope.weebly.com/uploads/1/3/5/3/135305195/143b5.pdfIn PDF document text
    • https://modisogisutoval.weebly.com/uploads/1/3/5/3/135390942/efdb0d9.pdfIn PDF document text
    • https://zomuguwiremadak.weebly.com/uploads/1/3/1/4/131406071/kesugadapimabuninenu.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/Hjr6hj2/47721315263.pdfIn PDF document text
    • http://bugexavitikuv.22web.org/36539111287.pdfIn PDF document text
    • https://zakoponuzu.weebly.com/uploads/1/3/5/9/135992890/xedejopezajak.pdfIn PDF document text
    • https://tobisimotar.weebly.com/uploads/1/3/5/3/135330661/zufutumoxewev.pdfIn PDF document text
    • https://muragifenujokuf.weebly.com/uploads/1/3/1/1/131164382/pujulaj-sepatisusi.pdfIn PDF document text
    • http://dukepiweg.iblogger.org/2825417348.pdfIn PDF document text
    • https://zogadinarele.weebly.com/uploads/1/3/1/4/131409244/didewabezutoweme.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/0jjjfgj/cafe_racer_jacket_style.pdfIn PDF document text
    • https://cdn.sqhk.co/mivufarowiwi/BntfFhc/ulti_meme_soundboard.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_cd84446c2ba347afa0214b4d4d93b6e4.pdf?index=trueIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_3374f12eb4844315908b692fc89ef403.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98265dd0-7b3f-48ab-82f9-976d21a6aadd/a_frame_chicken_coop_design.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_be4e4f07c8fc41b6b504c2a1ed0fc329.pdf?index=trueIn PDF document text
    • http://gozozofufeb.rf.gd/58224863650.pdfIn PDF document text
    • http://guvewenif.epizy.com/xamakebosimos.pdfIn PDF document text
    • http://burerekel.rf.gd/effects_of_water_pollution_on_human_health.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ac7eac3-0a1e-474d-a067-3e5ea50c2f5e/91983638428.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001323f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323F 5420 bytes
SHA-256: 4a338a85751c43b4185b4e2abc3c15d5dc7dd9c9362afb9733d49aa298b618ac
font_01_sfnt_off000144bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BF 11672 bytes
SHA-256: 0995c687b73f915ea47fe7f126bf4f834c3091f5fa2dd2d69168c98bad76cf10
font_02_sfnt_off00016c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C9D 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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