Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b98136432df2e3a…

MALICIOUS

PDF

75.1 KB Created: 2021-06-08 14:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 012289c2dba38767b66b841b66b3447d SHA-1: 3e5d726f31b850a15c970a60d5f279c74f447ef6 SHA-256: 2b98136432df2e3ac86b36c5a19788ac6abb0a9ea506c08c5efa3bc040aa42ab
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or spam distribution tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

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://oniceh.ru/pbw?utm_term=rational+emotive+behavior+therapy+pdf+albert+ellis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387939/normal_605fb51d08d1f.pdfIn PDF document text
    • https://pozufijuxib.weebly.com/uploads/1/3/0/7/130775557/fomowit-xokapevul-sujuxize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492875/normal_605f56c7b4c66.pdfIn PDF document text
    • https://mekesenewinev.weebly.com/uploads/1/3/4/2/134234563/1985616.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/5f726e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482629/normal_5fc6a0bb4a650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_600e22c9ce866.pdfIn PDF document text
    • https://sapixokevabose.weebly.com/uploads/1/3/4/4/134498139/vaputajawap.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/fitaniretofix.pdfIn PDF document text
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/debafor.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4446931/normal_60b5d7b5cece5.pdfIn PDF document text
    • https://takotowi.weebly.com/uploads/1/3/4/3/134356266/2682981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juwelite.pbworks.com/w/file/fetch/144559269/numeros_divisores_de_1246.pdfIn PDF document text
    • http://lowigamivux.pbworks.com/w/file/fetch/144838494/95908196451.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/kopezisuxew.pdfIn PDF document text
    • http://luwivaj.pbworks.com/f/how_to_use_zao_outside_china.pdfIn PDF document text
    • http://namebitepu.pbworks.com/w/file/fetch/144738093/88677525948.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/f/zofabokavewivog.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/marvel_avengers_endgame_theme_song_mp3_download.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_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 5592 bytes
SHA-256: 868a9235181662e305f0927fc23d2715687b0c340c159057c89374335645e3ab
font_01_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 10480 bytes
SHA-256: b7520587b1c7b0a5d79946340e7bac98b249e186d65354d984f3eb69e0acbeba