Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81dc3d70fb06496…

MALICIOUS

PDF

77.7 KB Created: 2021-03-20 19:55:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6deba04d5794ae4eb42a6340764bb747 SHA-1: 79fdb244eabf810f23913253a168e81c5bcdc010 SHA-256: c81dc3d70fb06496dfacf374d87e1738ffd576204c8cc2a90f40461c08f70476
244 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on disposable domains and point to potentially malicious content. The heuristic firings indicate it is a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK rule. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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
  • 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://dafemum.ru/wix?keyword=how+to+use+sears+manual+battery+charger In PDF document text
    • http://gelchlen.fun/493793060605269v.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/niwobuz_vedogijezap.pdfIn PDF document text
    • https://berarenojinoz.weebly.com/uploads/1/3/4/7/134737003/nofebabolexelazawo.pdfIn PDF document text
    • http://mkr-olimp.info/how_much_is_nikon_d5100_in_nigeriatm0j6.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/6659729.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/mifarafuxozu-defotufosud.pdfIn PDF document text
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/gopixulote.pdfIn PDF document text
    • https://rajizoru.weebly.com/uploads/1/3/1/8/131856770/karexuvibiruvi.pdfIn PDF document text
    • http://donbetosstreettacos.com/insignia_24_inch_tv_remotebp8an.pdfIn PDF document text
    • http://siteznakomstv69.space/52931355169j4dil.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/rideleloluda-fopoxibokugemuv-pelinepup-zowuwovipele.pdfIn PDF document text
    • http://rameautbxy.space/xasakasolatozekvp5v.pdfIn PDF document text
    • http://bionatur.space/35822538587c48tp.pdfIn PDF document text
    • http://dkmz1.club/how_to_use_international_phonetic_alphabet6ra51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_f40af0fbbcba4f6ebf24d85d62dd6ab2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/kajedaremixaro.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/battlefield_bad_company_2_vietnam_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/zagefulapuxinijig.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_55baa1f5ab494209a3df3a3de2720092.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_off0000f294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 5508 bytes
SHA-256: bef46494431b395548a2514d794f980b8bf36f1762f4777d78efcfd8b5cb9bc8
font_01_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 10640 bytes
SHA-256: 536c30fe0001fc1ab770ec742432964c3928b7b0ae7c4997f49f7caf24f7b7f3

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