Malicious PDF — malware analysis report

Static analysis result for SHA-256 128577ece5810e63…

MALICIOUS

PDF

69.3 KB Created: 2020-11-26 02:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7ec86ea318aace348638069254ce9a68 SHA-1: e0cd59230cb442b9e0ab7b3e80b027dbbd9e2849 SHA-256: 128577ece5810e63bcb65bf0bbffe250aabb00d06633dd754e52816bb41d1c99
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content or exploit vulnerabilities.

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://traffnew.ru/strik?utm_term=chapter+4+tissue+the+living+fabric+test+answers PDF link annotation
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/mapan.pdfIn PDF document text
    • https://nozigofomin.weebly.com/uploads/1/3/4/4/134481739/466e2c5054d6.pdfIn PDF document text
    • https://wukemurorafol.weebly.com/uploads/1/3/4/3/134338373/6462556.pdfIn PDF document text
    • https://watuwejaxor.weebly.com/uploads/1/3/4/4/134437052/tobepezamonidum.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/97878.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/883903d.pdfIn PDF document text
    • https://bavobero.weebly.com/uploads/1/3/4/5/134585538/d595164e33212.pdfIn PDF document text
    • https://kobigaxa.weebly.com/uploads/1/3/3/9/133997295/repiwon.pdfIn PDF document text
    • https://sebidodeg.weebly.com/uploads/1/3/4/4/134438526/zuvifixogafakix-fabikujo-guretaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_5faf126b75cc9.pdfIn PDF document text
    • https://fozabezadako.weebly.com/uploads/1/3/4/6/134639332/6b218b.pdfIn PDF document text
    • https://nisutezobeta.weebly.com/uploads/1/3/4/4/134486685/7070995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f873ae29c5b0.pdfIn PDF document text
    • https://wovuxitijijigot.weebly.com/uploads/1/3/4/5/134524902/sapadebimatovuzik.pdfIn PDF document text
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/wudatexeworebip-mijeru-jepibapimuvo-didonokine.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/87dc7773-41a5-4cdb-b282-b34675470306/78889582723.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_off0000c62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62E 5452 bytes
SHA-256: 555ace0de7d4373188e8a110abab8e3f51b3af7e47566a8299083e649010d5c6
font_01_sfnt_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 9684 bytes
SHA-256: 8593bfd4c328dd508c152505cd26d5ae608a07d2114d71638bc791318dc39c63
font_02_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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