Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50b38df0174c257…

MALICIOUS

PDF

71.2 KB Created: 2020-11-26 04:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 257dccc08ac97ee186f958b4161d429f SHA-1: e65daf5b981f3e7da2ee61af3fe34e6746196d0c SHA-256: a50b38df0174c2571885dc20efb3c0bf7854ce84d761ea20f69e1b63aef03fee
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting or redirector services, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. The primary URL, 'https://traffmen.ru/123?utm_term=stream+in+the+desert+verse', is flagged as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/123?utm_term=stream+in+the+desert+verse In PDF document text
    • https://teduruperalugo.weebly.com/uploads/1/3/4/3/134320262/julomiwuxagubax.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/19e83d11f48f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469645/normal_5fb5d2a2e92ee.pdfIn PDF document text
    • https://jimirona.weebly.com/uploads/1/3/4/2/134266163/1480199.pdfIn PDF document text
    • https://tabuxeniki.weebly.com/uploads/1/3/2/6/132682737/banovalamaxiz_ganagatibamefam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453540/normal_5fb49b885f678.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/0c18874847f.pdfIn PDF document text
    • https://mixekolasum.weebly.com/uploads/1/3/4/3/134388380/tuwokodi.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/feredumitiriz.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/9cacfa13-ee1c-4aeb-a98a-fcdad8f3b3d3/zusumodogomeverefone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dceefe4-b14a-4b0e-93c7-e111da21c6ad/crack_clean_my_mac_3_francais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7e5c59-c7e7-4514-96cf-8aba3821482c/79921556529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9090d0a0-fc3b-4a7e-be9a-d3ea9b563474/74845930036.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_off0000ce48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 4876 bytes
SHA-256: eb279db71d32feea5e6e3f5ab4972026f8ed180119182312d4099bdabaaa9217
font_01_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 10372 bytes
SHA-256: da140fe273024648c7d95561f09ea90508c39f4fed771894b1cd94d9f2f37bc4
font_02_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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