Malicious PDF — malware analysis report

Static analysis result for SHA-256 041401a30889a831…

MALICIOUS

PDF

77.7 KB Created: 2021-03-17 19:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8c4ecc79f92397a0784109ca35615424 SHA-1: ccb199876f159d68a22cd985514281ace25c39fe SHA-256: 041401a30889a831f1d57aeeebf2c989172f41af76ed9764328c08d68b48c503
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to potentially harmful external content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://botokaw.ru/wix?keyword=basketball+team+goals PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387566/normal_5ff551652c01a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_601547d6ad620.pdfIn PDF document text
    • https://cdn.sqhk.co/soribivevi/WuHViey/sonana.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/ahfidYv/emergency_dental_care_near_me_that_take_medicaid.pdfIn PDF document text
    • http://tumijosejagag.22web.org/58005122768.pdfIn PDF document text
    • https://konegodifoxud.weebly.com/uploads/1/3/1/3/131380175/jimodifibukoti.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/g1BBBsN/sogebanking_numero_de_telephone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450878/normal_5fde8b5798137.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/20jabhc/26381063032.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/jDjhWhi/wunijap.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/9817969.pdfIn PDF document text
    • https://cdn.sqhk.co/tekemozuj/iimknij/wiwalefig.pdfIn PDF document text
    • https://cdn.sqhk.co/zazavoxujub/ipgejer/delenasetikazamoxeragizup.pdfIn PDF document text
    • https://wemuwenaxi.weebly.com/uploads/1/3/5/2/135298044/tevetuza_rumoki_watamaj_natejevez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9223e4b1-68ae-49f7-8a6d-e50d25c95fce/jalosenito.pdfIn PDF document text
    • http://wedoguname.rf.gd/32731233941.pdfIn PDF document text
    • http://togubetaxiki.epizy.com/wordpress_website_development_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5f92ed-9d84-4703-bdd2-843a8d643685/39139346705.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 4796 bytes
SHA-256: 51276c59045f48cd7579e3cb15d73ca3ebdb77d0b4dade028fd3a3f362205064
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 10468 bytes
SHA-256: 52bcd07476db412a8c5eb29bea6dc5c8a6ef1fcba4c87c118bc061cb4a97476e
font_02_sfnt_off00011a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2