Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa43fa8513f184fa…

MALICIOUS

PDF

85.8 KB Created: 2021-03-28 06:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9f55567a77a9c5746e43fbb50e035371 SHA-1: 20316bacbb9a1bd222c9fb452dc6dd09c88dfde6 SHA-256: fa43fa8513f184fa39bce97d918608b700b1b1837d6841dd5bc6a64be12e8ebe
186 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, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a phishing or scam lure, likely intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/wix?keyword=verizon+phones+with+big+numbers PDF link annotation
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/6132146.pdfIn PDF document text
    • https://cdn.sqhk.co/matezafun/3hhMhj9/aucccd_annual_report.pdfIn PDF document text
    • http://mavixepajifulem.scienceontheweb.net/16975695508.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/jfhaogf/25612107418.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/fewakamapazuma.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/business_english_vocabulary_in_use_advanced.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/pipimorav.pdfIn PDF document text
    • https://jarosebat.weebly.com/uploads/1/3/4/6/134695718/e253fecfc9.pdfIn PDF document text
    • https://sejelenowoloza.weebly.com/uploads/1/3/4/5/134518320/29f24c4.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/an9hiib/43175958706.pdfIn PDF document text
    • https://cdn.sqhk.co/latipizi/gCjd1ja/yeezy_boost_v2_bred_real_vs_fake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/bupuwis.pdfIn PDF document text
    • https://a181bb3e-7445-4f1f-a1cf-b2fe66c13e92.filesusr.com/ugd/91ce54_ba240bb4dcb2440a865ab30b43247e9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujodibu/wazejojir.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/wabotez.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/what_is_the_best_free_animation_software_for_beginners.pdfIn PDF document text
    • http://xanedemu.onlinewebshop.net/83753508335.pdfIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_76f8e9177f3b46dca779d2cec68a2b70.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_off0001126b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126B 5236 bytes
SHA-256: 5f1c5fcee0ac6e2a41fa54f7f38c02a1375828f9bc7a5f4b53d49e67a8c46b66
font_01_sfnt_off00012431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12431 11012 bytes
SHA-256: 406e8dff958cf9d51db28aa5c509cd1004e0e89cf6d8d1827d7f0f77cffc595c

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