Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c778f3dd5bc21b7…

MALICIOUS

PDF

78.9 KB Created: 2021-04-09 08:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 746f29e68f88a460c27d4af3a5489d34 SHA-1: cd87aeef216062fd9f82fafe5be34318cc1b1685 SHA-256: 4c778f3dd5bc21b78c736be236ea656822d942359038342dce9678b6c65ef61a
186 Risk Score

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 0.9997

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://gimoguvi.ru/strik?utm_term=historia+econ%25C3%25B3mica+general+de+m%25C3%25A9xico+sandra+kuntz+libro+completo+pdf PDF link annotation
    • http://vibolofisef.mywebcommunity.org/69391220389.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/Kjcgbgc/vifusanopomoxevefotuxi.pdfIn PDF document text
    • https://ribavazo.weebly.com/uploads/1/3/5/3/135322422/b6d18f.pdfIn PDF document text
    • https://cdn.sqhk.co/bemoranoz/8hbI2ie/54135218244.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/94734474847.pdfIn PDF document text
    • https://wikamarelifegef.weebly.com/uploads/1/3/4/3/134380256/mobabomil.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/8960288.pdfIn PDF document text
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/saluvomutabevad-gowov-solifarizizi.pdfIn PDF document text
    • https://gojufepegaxop.weebly.com/uploads/1/3/4/3/134339744/6902007.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/QPhjZsH/palusivopomezodej.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/hLMiehi/fomapedafasivop.pdfIn PDF document text
    • https://timodidub.weebly.com/uploads/1/3/1/3/131379596/a22609.pdfIn PDF document text
    • https://mezemefi.weebly.com/uploads/1/3/1/3/131384279/1022896.pdfIn PDF document text
    • https://nogalagamepet.weebly.com/uploads/1/3/0/7/130738620/xisopopiwug-biliz-vatisin-pivemalibo.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/bjbZ4b1/sivuwusepovenoxazagam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobewegogiz.rf.gd/arnold_chiari_malformation_fetal_ultrasound.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_ac98634cae3041b687f2bb01ff375ec8.pdf?index=trueIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_8557d80df3e54a709aa839ad27960bc3.pdf?index=trueIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_77ac635895d842aca2ad639985b70811.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_f467ea7cf1984b63b12352811dc48b18.pdf?index=trueIn PDF document text
    • http://xafegewoweli.epizy.com/ditejizob.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_d5452536e9c14f9dbb964d997d1f7d79.pdf?index=trueIn 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_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 6036 bytes
SHA-256: c0af1f2302e8b57fb6825f40ef67d6ec684b8c02ca7ba54b115fe16d1c8b2d12
font_01_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 11528 bytes
SHA-256: 8633cc2fce3546aa794f8c496e37f85a728f28e753c8ff2c26dc415f7255a37d