Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11384c77372c1a3…

MALICIOUS

PDF

71.6 KB Created: 2021-06-03 23:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c0faf75ae73814e3c009a58f4dfca00 SHA-1: 743850e10e3dcba4d09eb90aa671b772f7904428 SHA-256: f11384c77372c1a3cf21e6e7e50cc99c7f511a6ae1a9d24853323644e7f442d3
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://queure.ru/pbw?utm_term=netgear+ac1200+wifi+range+extender+review PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4392854/normal_60aff8f27d827.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/kagumugevigu.pdfIn PDF document text
    • https://noloxuxema.weebly.com/uploads/1/3/1/4/131453633/kazeduwotuw_pibefujenagere_xebomujodimo.pdfIn PDF document text
    • https://nudikiwo.weebly.com/uploads/1/3/4/0/134042489/8946842.pdfIn PDF document text
    • https://jakikoxu.weebly.com/uploads/1/3/1/4/131411542/xazovadajaxagax.pdfIn PDF document text
    • https://monotuwisax.weebly.com/uploads/1/3/4/5/134589760/9988729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_5fd27a084953d.pdfIn PDF document text
    • https://ladevizeloraben.weebly.com/uploads/1/3/1/6/131606454/1087705.pdfIn PDF document text
    • https://jisiresofuwidi.weebly.com/uploads/1/3/0/7/130739297/dazepezutosuvukumu.pdfIn PDF document text
    • https://xaforexu.weebly.com/uploads/1/3/0/7/130775472/972246.pdfIn PDF document text
    • https://kinijanara.weebly.com/uploads/1/3/4/5/134585029/3298051.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144412083/26746792705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72696881-2eab-4306-99c6-a5a799edba37/remegovogebizaro.pdfIn PDF document text
    • http://finebov.pbworks.com/w/file/fetch/144472506/phillies_seating_map.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144568053/13684420458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13270d6-2896-4693-9b32-ccecbef176d0/dell_e7470_bluetooth_driver_download.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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 5496 bytes
SHA-256: 06a3dad56c54884987e9283c24404c039405b5ea347014917f6e2861e7f295bd
font_01_sfnt_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 10728 bytes
SHA-256: 995530493085a1404470c94c2a9def4da70c880dbf6b5d5b3b7777d175dc8d5f

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