Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8c836fc80ecdbd…

MALICIOUS

PDF

81.2 KB Created: 2021-03-01 12:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31c23f0842769c8e4b3950c0a12feee6 SHA-1: 39b2ce2e82b82d5ff0bd257991427918cf14ce09 SHA-256: fa8c836fc80ecdbde898004a1cd217e1e940ad5383f71a21165cc643e2d53d97
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, identified as a 'link farm', suggesting an attempt to manipulate search engine results or direct users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or content-farming attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=which+phones+work+with+tracfone
    • https://cdn-cms.f-static.net/uploads/4494160/normal_5fd66f449d6f9.pdf
    • http://magnetfix.store/tuluforonaua530.pdf
    • http://bullbananavannaone.xyz/what_is_the_purpose_of_social_work_supervisionir197.pdf
    • https://cdn.sqhk.co/zimajigon/hbjajaM/kanuguduxa.pdf
    • http://armlur.space/how_to_take_apart_lg_top_load_washera4atq.pdf
    • https://cdn.sqhk.co/zekafomaze/hajjRRD/cooking_fever_automatic_machine_alpine_meat_palace.pdf
    • http://adyga.site/55843467964a9vyt.pdf
    • https://cdn.sqhk.co/zabitokepum/ljd4zg6/metorekanefasozavuwo.pdf
    • https://cdn.sqhk.co/vuvapolaxaj/Piajdgc/jonera.pdf
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/zadasuvegifeguvaleju.pdf
    • https://tavabaxo.weebly.com/uploads/1/3/1/0/131071290/dd2b8162c3365c.pdf
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/wefirixaguxep.pdf
    • http://2gusevshop.space/homescapes_online_uk9abx8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nutanigonu/live_wallpaper_for_computer.pdf
    • https://s3.amazonaws.com/fadobirak/computer_service_price.pdf
    • http://nopawalaxuwaw.onlinewebshop.net/ejercicios_notacion_cientifica_matematicas_3_eso.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f382.bin
46058c1a0d454220f08981eaaa17ba6c9c12392205067f930921474d2d11e974		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 5028 bytes
font_01_sfnt_off00010496.bin
b590ed1794fc76339a66c38f49f22a26ed1d0a13a1701e51e626edfad8fefd59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 10876 bytes
font_02_sfnt_off000129cd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 4324 bytes

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