Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb0c7e6d91c8963…

MALICIOUS

PDF

79.1 KB Created: 2021-02-23 04:34:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: de30eb4c36aff89acbdab509fa2e9623 SHA-1: 3a76b126c45b992071f36e4dbf60909f54d4a1b0 SHA-256: 8fb0c7e6d91c89632e275eeb26787ad9ac39693eb02b116ef4fccd8ded1825c6
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 0.9998

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
  • 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://seumenha.ru/aws?utm_term=g+shock+mudman+g9000+dimensions PDF link annotation
    • http://juniwasobevi.22web.org/helicopter_mechanic_resume_templates.pdfIn PDF document text
    • https://tobalewaluwe.weebly.com/uploads/1/3/4/4/134437424/9621142.pdfIn PDF document text
    • https://bolukuja.weebly.com/uploads/1/3/0/7/130739437/tefizofibix.pdfIn PDF document text
    • https://libizegenumejav.weebly.com/uploads/1/3/0/7/130775388/fugalegedov.pdfIn PDF document text
    • https://sapafusazefo.weebly.com/uploads/1/3/4/4/134496158/1452722.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/tagaxuropo_xexilinaveb_tanad.pdfIn PDF document text
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/dcb1af932add.pdfIn PDF document text
    • https://boziwigezuzes.weebly.com/uploads/1/3/5/9/135984517/gijadiliz.pdfIn PDF document text
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/jokabofole.pdfIn PDF document text
    • https://wozijasobinela.weebly.com/uploads/1/3/4/4/134445001/510ce47cefee.pdfIn PDF document text
    • https://lasasokuvob.weebly.com/uploads/1/3/1/6/131607269/4fe038fdfc25af.pdfIn PDF document text
    • https://gugamuwapubadek.weebly.com/uploads/1/3/0/7/130740318/turogavozakewe_jilomivo_favemodav_senudawer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lusalelafujijo.epizy.com/maths_addition_worksheets_for_grade_1.pdfIn PDF document text
    • http://sitidex.epizy.com/rava_cake_recipe_in_marathi_video.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/happy_birthday_my_love_pics.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/44589019387.pdfIn PDF document text
    • http://gafevudivexer.rf.gd/ewg_guide_to_baby_products.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/editable_calendar_template_microsoft_word.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_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 5620 bytes
SHA-256: 4d546f99649ad92cf3133afe30e4d486db7ebee23271d6690a989667d816ec78
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 11068 bytes
SHA-256: ea583e95b23532ff0de7826e7bc8457eb01adc09d98cd760528368e4a168cbb5

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