Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62aa92a918c9fc4…

MALICIOUS

PDF

91.1 KB Created: 2021-03-29 04:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: da5d62db01bb66de4e9b1c48f1e60b3e SHA-1: 53f96f134f12d52fac76d72bb0f85fb25bfc946f SHA-256: d62aa92a918c9fc434dd31218fc523c29f15a6e3d7fe501eb7a5ec6894c5f265
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/award?keyword=blazer+express+32+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452374/normal_602df536a2c45.pdfIn PDF document text
    • http://faxizila.iblogger.org/fofuletomorifoxomoramom.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/long_run_cost_function.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473039/normal_600dd84455057.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465403/normal_5feb9ede8b192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_60143952032b4.pdfIn PDF document text
    • http://rubokapaj.22web.org/19455779925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_6039f3fb7ea97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_600a07835e2ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fd11199cfee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475847/normal_6027bf37beeb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417141/normal_5fc5c585b1568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_603a6a175f40e.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
    • http://nisetekotixob.myartsonline.com/what_is_a_due_diligence_checklist_real_estate.pdfIn PDF document text
    • https://36ba0bd5-485c-4bd5-924f-6a5e18dcb854.filesusr.com/ugd/96419b_9ba68abe0eca4bf3a1ae94359f682233.pdf?index=trueIn PDF document text
    • http://jazovojekil.rf.gd/4070655438.pdfIn PDF document text
    • http://kifagugurubox.rf.gd/adobe_indesign_beginners_guide.pdfIn PDF document text
    • http://jizuvopanusin.rf.gd/hayward_1.5_hp_power_flo_matrix_above_ground_pump.pdfIn PDF document text
    • http://dudulexo.epizy.com/86875671370.pdfIn PDF document text
    • http://jujewejono.epizy.com/80951456115.pdfIn PDF document text
    • http://dekifovep.epizy.com/cultural_identity_articles.pdfIn PDF document text
    • http://gogujigasad.onlinewebshop.net/37764715123.pdfIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_fa663e317afb46ec95eba982e8dec035.pdf?index=trueIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_ed342ea7ac4640b59b19fb7476fc9b62.pdf?index=trueIn PDF document text
    • http://gexalejal.epizy.com/nursing_diagnosis_list_for_postpartum.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 4940 bytes
SHA-256: 55ac1dce4ec72990e39b6f5dbbc932dac41a6f8720eb300ec36abd03d1643d86
font_01_sfnt_off00012c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 12000 bytes
SHA-256: 8a67ba7426b0346190cc2418305703a7ef39506fa8d67a7699b905c8352bd448
font_02_sfnt_off000153da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34