Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33e9f5299658304…

MALICIOUS

PDF

80.3 KB Created: 2021-03-07 09:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7b83674516d5cbb160c746a13bb25195 SHA-1: 5fcc0c13d6a3f701c46716fca9cb90367afbc1cd SHA-256: b33e9f5299658304978de371839b14a163c7e22dba1cc8913691132653df3eb5
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs point to various PDF files, likely intended to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure and link farm heuristic indicate a malicious intent to redirect users.

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://gimoguvi.ru/award?keyword=nitecore+intellicharger+i2+not+charging PDF link annotation
    • https://dezusopivelisuk.weebly.com/uploads/1/3/4/7/134734284/9251431.pdfIn PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/138704.pdfIn PDF document text
    • https://tawibusosazad.weebly.com/uploads/1/3/4/6/134646708/sozepefuw.pdfIn PDF document text
    • https://cdn.sqhk.co/jolekusij/hdjdWje/graphic_design_portfolio_template_illustrator_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nujusowidom/fkwA7ja/rokojoganopobixas.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/6Zc2v8t/ugm_salem_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/a5pBazR/rivals_at_war_2084_mod_apk.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/701a5.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/puxewebijaxop.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/8279333.pdfIn PDF document text
    • https://cdn.sqhk.co/navififoro/Phh5Rpo/suzizafopakaraxuwem.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/gihaXje/vejurajijopinim.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/CpCjcge/strategy_consulting_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/gcjhphe/43040312496.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/sgjigif/saladin_patterson_net_worth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevitejivojo.rf.gd/how_to_train_for_a_half_marathon_beginner.pdfIn PDF document text
    • http://wawugodeti.epizy.com/tixakizufemudamipubixad.pdfIn PDF document text
    • http://mozutebileba.rf.gd/how_do_i_unlock_my_honda_radio_code.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 4984 bytes
SHA-256: 0459448de6ffaed603d8be1d60fea6511d513857f8ab0dff0c3037c9801b3ffa
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 10808 bytes
SHA-256: 1b13ab23c38e91ec9b5fce3b37b93de73dd79c20ca6fb9e1cc1fac5be2401716
font_02_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 16204 bytes
SHA-256: 73bb1f519e29941fc98367ae33a8b679223d41029fbf73fb5c585da9ec8c2502

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