Malicious PDF — malware analysis report

Static analysis result for SHA-256 870faaaecd3e73e1…

MALICIOUS

PDF

78.9 KB Created: 2021-05-29 10:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: db40d85adf9b41c836f67bd97f20c8ed SHA-1: 2971ee276386c5b4e83da00e489c4aaa6fe973e1 SHA-256: 870faaaecd3e73e14cf0495e24916c3012f5e58c01d9dd4f954f414fcf1c95e7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://lozipotod.ru/123?utm_term=biblia+cristiana+pdf+descargar PDF link annotation
    • https://jufigewadekuxo.weebly.com/uploads/1/3/1/4/131406441/junilezupuzugexilur.pdfIn PDF document text
    • https://pakunifa.weebly.com/uploads/1/3/5/3/135307874/6ace806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_60248b54d06d3.pdfIn PDF document text
    • https://duwizule.weebly.com/uploads/1/3/4/6/134663296/xususakunipib_roninopezatopan.pdfIn PDF document text
    • https://momekefu.weebly.com/uploads/1/3/4/8/134850451/javugasadirujib.pdfIn PDF document text
    • https://tofeniva.weebly.com/uploads/1/3/4/6/134625175/2598415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_601aff4d4b4e9.pdfIn PDF document text
    • https://gijagexerifaru.weebly.com/uploads/1/3/5/3/135322880/tizuxorop.pdfIn PDF document text
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/1b1bf31.pdfIn PDF document text
    • https://sijotifibiga.weebly.com/uploads/1/3/0/9/130969940/a69a9.pdfIn PDF document text
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/987b3b67.pdfIn PDF document text
    • https://genifefesabido.weebly.com/uploads/1/3/3/9/133999330/seranawod.pdfIn PDF document text
    • https://xemifedawunata.weebly.com/uploads/1/3/0/7/130775780/132923.pdfIn PDF document text
    • https://lipixikipated.weebly.com/uploads/1/3/0/7/130776445/taxelawotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_600d86a7ef682.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5fcac7460a5e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_6046e412ee2dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf25a0e-3238-447e-add5-c1e8b4d7d1f4/merce_rodoreda_la_plaa_del_diamant_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490dd6dc-b5b6-4198-bacb-f850fb3b9551/68723709349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/982790c6-70f7-4602-b076-b465996caa3a/mechanical_engineering_jobs_in_bangalore_peenya.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 5512 bytes
SHA-256: 1bc00a0b7d8bba6bde14d3b3a2ffccda961008552f94e8d56c66ff7944440b40
font_01_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 12500 bytes
SHA-256: a7317290d0a500f6ed7abdd79ae9d661070496140fa668170d47cff6610361df

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