Malicious PDF — malware analysis report

Static analysis result for SHA-256 38905311a653c5ec…

MALICIOUS

PDF

72.6 KB Created: 2021-02-13 20:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f0fdbf87cfeccdb30e2b8b936c3f853e SHA-1: 284fc69f48c32b7bb95d530352fe30456811809f SHA-256: 38905311a653c5ec5bdc294691c0e859950c2cc04c9b81e32292f6040537fb72
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 hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=que+es+el+acoso+psicologico+pdf PDF link annotation
    • https://cdn.sqhk.co/jesupasuzoku/fMhgCIr/vinix.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/TihKhb4/rudavotenijibavon.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/mefovo_rafovu.pdfIn PDF document text
    • https://mafakovik.weebly.com/uploads/1/3/5/3/135347242/1679688.pdfIn PDF document text
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/tavebevoviboxevi.pdfIn PDF document text
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/6eff4ee5a1954ff.pdfIn PDF document text
    • https://cdn.sqhk.co/wetotuluxe/24vzsha/my_verizon_business_account_login.pdfIn PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/2830083.pdfIn PDF document text
    • https://cdn.sqhk.co/taxuvoguraji/yigJPow/ninja_arashi_2_game_play.pdfIn PDF document text
    • https://xekuruwagimutuz.weebly.com/uploads/1/3/2/6/132696141/lomepatevuduliruf.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/fresh_potato_mask_sheetxz2a5.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/didopowaterobemikade.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/igijc2t/48013305184.pdfIn PDF document text
    • http://br1.red/57973152048y7eg3.pdfIn PDF document text
    • https://cdn.sqhk.co/xewiliwilax/ihYib8z/11570752799.pdfIn PDF document text
    • https://cdn.sqhk.co/vimitewimuwi/dibuiaS/lolax.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/kavifunaruvi/fofifitufipovadisa.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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 5288 bytes
SHA-256: b283aed71e2dbbd822e8e5ebd9c8391e0cf475a9b890950e47a39778d6ea6c4e
font_01_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 11160 bytes
SHA-256: b14aec427540b1272df73edda332042486363b38227253dc0fcf852eb409ccf4

Open this report in the interactive analyzer, or submit your own file for analysis.