Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3934fa7adcdc685…

MALICIOUS

PDF

77.6 KB Created: 2021-02-21 06:36:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 62e85ab6523578022dc9a8ce4247a719 SHA-1: 14a6a46192dec22c6c202e7e07763cfb4ba008e5 SHA-256: b3934fa7adcdc68501d216dff2ba97b7e1a41309c425b7484fd79b4a040a17f2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to car overheating, likely a pretext to drive traffic to the malicious URL. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly indicates malicious intent related to link manipulation and potential malware distribution or phishing.

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://baarspo.ru/strik?utm_term=why+is+my+dodge+grand+caravan+overheating PDF link annotation
    • https://cdn.sqhk.co/dabeluza/THPhcjc/smackdown_wwe_wallpaper_new_title.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451205/normal_5fec2a99868c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495262/normal_5fffdf4787e0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_60130c798506f.pdfIn PDF document text
    • https://cdn.sqhk.co/xexegapimuwi/viawifO/superkart_250_2t_usato.pdfIn PDF document text
    • https://cdn.sqhk.co/fefuxumito/hhjiiia/36633442671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5fd0aeade5be9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450730/normal_5fcb78e9f25f9.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/oXhahcR/xanibiguzilebanutumi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391611/normal_5ff1ddc24ab14.pdfIn PDF document text
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/7354d1f98b.pdfIn PDF document text
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/4423725.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463791/normal_5ff7d119657fc.pdfIn PDF document text
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/dubunos_rimobup.pdfIn PDF document text
    • https://wexaluzeneroxer.weebly.com/uploads/1/3/0/7/130776054/xodaxufaboxif.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/9hjjfvo/14900672524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_6027c9343ec69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lupuvogotog/edema_angioneurotico_de_quincke.pdfIn PDF document text
    • http://mojebevusawibo.rf.gd/xafegotubevutoxolar.pdfIn PDF document text
    • http://pelubameta.epizy.com/80842041088.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 5284 bytes
SHA-256: 23cf42504423b62b9a2f7d4a99aa73633d8cf0abe95a88261bb067d8ed01c9bd
font_01_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 10232 bytes
SHA-256: 4bcd66cf72a332bda34604ef111d8f1d08fddaf74465bf106c9ed2b746081901
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c