Malicious PDF — malware analysis report

Static analysis result for SHA-256 745b1350366f73e2…

MALICIOUS

PDF

78.0 KB Created: 2021-04-17 16:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3eb3b7896bb1e42e47771ac800a78f1f SHA-1: b2227f86b1bb9361a75aebde06a5fe0c2a2ee19b SHA-256: 745b1350366f73e23649eb649585d811cead95c718de335e28ca0aeb6a7997f4
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The primary redirector URL is associated with known malicious activity, and the ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a query about purchasing a SIM card, likely a lure to disguise the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=where+can+i+purchase+a+tracfone+sim+card In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5fda7ed49a0f7.pdfIn PDF document text
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/dobobelaxer.pdfIn PDF document text
    • http://swast-group.website/1451451800q35z3.pdfIn PDF document text
    • http://doweryklkq.space/569221995010nlu1.pdfIn PDF document text
    • https://silosapa.weebly.com/uploads/1/3/4/5/134580216/472639.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/washington_football_team_score_last_night.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482215/normal_60603e91281f1.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/el_ftbol_a_sol_y_sombra_wikipedia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_606a3c93381f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_6013ed4ccc4cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_6036c5608c8a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_60306bb2b89fa.pdfIn PDF document text
    • https://vetepoxep.weebly.com/uploads/1/3/5/3/135302771/7dde10a7ad3f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_6044f635d9708.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/36201186782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503214/normal_606b620805f49.pdfIn PDF document text
    • http://strita.space/tulimefetixedowofawolipkitok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_60251fbe34d23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5fe6f0fa730f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f18f78-8a98-4b7b-98f6-91b579541f3b/dyson_dc18_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca05d77-294b-4adb-b85a-d425d4a14991/what_is_after_new_moon.pdfIn PDF document text
    • http://teropisarazo.myartsonline.com/sufofuwalavesewori.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 5376 bytes
SHA-256: 8869ba5d07bf9ecc7249606c81f3f972042a7262794449d4e706ef8899161d79
font_01_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 10752 bytes
SHA-256: 26a03f7fe0d6bbfaaf772b04c80a657bdd637a68957772a09eb995221e04e3b6