Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a4fa00a1b95956…

MALICIOUS

PDF

79.3 KB Created: 2021-03-27 22:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 506cf232e650e0631ed5641469398b4f SHA-1: f242e3de08cf2dc81cdb3dfb758b353dfea9ae5a SHA-256: 48a4fa00a1b959560d12a380364b66de3ee655e4b0f06134c5ec592067eac99e
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs, and specifically impersonates Facebook for credential phishing. The presence of multiple external links suggests it may download additional payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fagisidide.weebly.com/uploads/1/3/2/6/132682833/28105ea27.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://druttle.ru/award?keyword=digital+banking+in+vietnam+pdf PDF link annotation
    • http://steblin.pro/261015282440hr7t.pdfIn PDF document text
    • http://cmbmarketing.agency/404_binding_of_isaacclv4n.pdfIn PDF document text
    • http://swiss-gear.store/75564562649rclu9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_6044ae469e4e7.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/28105ea27.pdfIn PDF document text
    • http://itactical.xyz/melizidetedanipslchj.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/sezujojelij.pdfIn PDF document text
    • https://wojadamizaxit.weebly.com/uploads/1/3/2/6/132681796/7808696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_6021d6a027239.pdfIn PDF document text
    • http://rte-ita.fun/undeleter_apk_pro_crackedmx9yn.pdfIn PDF document text
    • https://dowidevegep.weebly.com/uploads/1/3/1/4/131406741/zifosomi-fovafibok.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/english_grammar_notes_file.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_60356f4916962.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/jumozorofivuropoxepike.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/is_sense_and_sensibility_a_good_bookushie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_bfa0435fd53a41dd849c2565bccc7b32.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_732162aa74114ffabee9e5d48b518520.pdf?index=trueIn PDF document text
    • http://fuvuxejuv.myartsonline.com/forensic_accounting_for_dummies_free_download.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_2ee0a7104ed749d996b55aa9ec71d866.pdf?index=trueIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_1448269e3953474688036e8811b40d5c.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_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 5352 bytes
SHA-256: 385a37501f24a68aba2d82db8b02bf1ccdbda5208a8004fe6d5098f42b26a4c8
font_01_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 11400 bytes
SHA-256: 316c15cdb4a04cd78d7b6ebc467cd0327e49fdf89582c8e916c1a6802cd40ddb