Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed48bcd77994297…

MALICIOUS

PDF

81.9 KB Created: 2021-03-19 02:24:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a98e3b96637355bafb9f3e9369b184a5 SHA-1: 594d8127e16c42628f7ddf86d4af79bb85f446aa SHA-256: aed48bcd779942977199ec2063e58a0fe1815376a81a5159639b0af28cfbad42
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://seumenha.ru/award?keyword=trance+formation+of+america+cathy+o+brien+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474720/normal_604add454ebf3.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuwudedi/obOhfja/jupuduwezobozugojoliv.pdfIn PDF document text
    • http://copyrightnotice-ig.com/pharmaceutical_organic_chemistry_download0ipen.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/1220426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416305/normal_6027d9a70e4da.pdfIn PDF document text
    • https://lonomunemol.weebly.com/uploads/1/3/6/0/136082408/d8a83cad.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvivemu/bhhigji/zig_zag_stripe_boutique_coupon_code.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458849/normal_60025781973df.pdfIn PDF document text
    • http://shoop-fk.ru/blue_card_application_form_printzhtfr.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoroxur/bLrsgjh/gepomerimajatininitobak.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/lilureton.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/gZiixge/10678182077.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/5576637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498404/normal_6052ec73e0bef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_604150b968a62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451545/normal_60061f52b8c85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413467/normal_5ff275daeb318.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_9b75aa8f16314246b4f0dfc1797e1b9c.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_cbae7ced5064422eb3ffb24f38678c20.pdf?index=trueIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_1c2f263b48d441438458b9020b594055.pdf?index=trueIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_7f5f5da06e734b83afd71cac67914340.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 5376 bytes
SHA-256: dc424ac34698a78934d7a96cc223909de2d498da6ce7f8e200e7b72276fce993
font_01_sfnt_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 11396 bytes
SHA-256: 224c58f7a7036d0cf299adc8e50c0d8dd878704383da093a380e970805cd5a96