Malicious PDF — malware analysis report

Static analysis result for SHA-256 c159b494c5bcb443…

MALICIOUS

PDF

72.8 KB Created: 2021-01-14 04:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 8f2ee12167116b77059c07471f59be97 SHA-1: 390b55d30e8ae675381652659b5e374de32d6409 SHA-256: c159b494c5bcb4439f99e959879246ba460e88075a693ef3f15d0ac3d84545cb
186 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a link farm designed to drive traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://traffset.ru/shook?utm_term=ball+drop+live+stream+2020+chicago PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497353/normal_5fd77a5c66c71.pdfIn PDF document text
    • https://nategenuniko.weebly.com/uploads/1/3/4/7/134749174/7206956.pdfIn PDF document text
    • https://site-1168413.mozfiles.com/files/1168413/granny_earn_or_die_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/linerutinew/igG1Mgc/45495899264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_5fbdcca192d4a.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/byjc7hh/losanubakenigituxav.pdfIn PDF document text
    • https://site-1178121.mozfiles.com/files/1178121/pac-_man_fever_2.pdfIn PDF document text
    • https://site-1179150.mozfiles.com/files/1179150/carteret_county_schools_report_card.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457311/normal_5fa76122499d9.pdfIn PDF document text
    • https://site-1084368.mozfiles.com/files/1084368/wwe_champions_fight_game_cheats.pdfIn PDF document text
    • https://site-1168510.mozfiles.com/files/1168510/xemirozegi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392444/normal_5ff50f2776121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f99ee0671282.pdfIn PDF document text
    • https://site-1203095.mozfiles.com/files/1203095/juremadiruwatadukifob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464707/normal_5faa53da49e85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 5868 bytes
SHA-256: ba284f0f0c5f04c5b6ec2d487cf5e71b129ad65460e2490c7e8773f3a5d94a42
font_01_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 10952 bytes
SHA-256: 0f11c9ed4f92236ea04921f10054c6a51d183538e6cf68b7b97c68d7aabf78b2

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