Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc989e4f07347d1b…

MALICIOUS

PDF

85.9 KB Created: 2021-03-02 01:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6d57133e69c609f61da1497845e6ead7 SHA-1: 5e4eaefa8fd9d27b9f68156459cbb8d57157364e SHA-256: bc989e4f07347d1b55aa762d6c2b3062baf777c23b34a4431ed8d7594397458b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The primary purpose appears to be directing users to potentially malicious content hosted on various domains, including disposable ones.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/wix?keyword=caber+toss+weight PDF link annotation
    • https://cdn.sqhk.co/nuvexajamu/chdeifB/gestion_d_equipe_commerciale.pdfIn PDF document text
    • http://kersita.fun/kasojoxexetunesunurerpxdwl.pdfIn PDF document text
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/rifukonalilimibimi.pdfIn PDF document text
    • https://rinizazekuke.weebly.com/uploads/1/3/4/0/134012784/deca1f9.pdfIn PDF document text
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/7098108.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/ijhiiOt/badobow.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/hhfchbQ/live_video_broadcasting_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/igdgjvI/fojerivikojezuwofebizasa.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/9e50cc.pdfIn PDF document text
    • https://baxugufidet.weebly.com/uploads/1/3/0/7/130776886/c1ab644a61.pdfIn PDF document text
    • http://avlto.best/gajobebunagevislb1jq.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/zilotisos.pdfIn PDF document text
    • http://amst-watch-v1.club/besukiwetapidokazafegzgqx3.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/43600179694.pdfIn PDF document text
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/eaaa5f2.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/bcia294/chameleon_run_deluxe_edition_switch.pdfIn PDF document text
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/766f38201f0e22.pdfIn PDF document text
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/8751632.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/fifty_shades_darker_english_full_movie_free_download_300mb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/pillars_of_eternity_2_inquisitor_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/van_helsing_tv_series_parents_guide.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_off00011681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11681 5052 bytes
SHA-256: 270b0bacce117349baf94da67c22ca6b9b1cc48a3f8c7fcd70679cb3c9b5e152
font_01_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 10080 bytes
SHA-256: a1ea7a69c85044ac795cee5d8486847551990b394d5385b6a3bd8aff3c6981c4

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