Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc22b4a6409dd92f…

MALICIOUS

PDF

80.6 KB Created: 2021-06-07 11:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e07fa8677a1654010dd505aa45d6e8f4 SHA-1: 4cf00bf70ff9cbef4ae0a81b9c05c75860fd8a17 SHA-256: dc22b4a6409dd92f96d4477d9fc5d94cfe790a741600506bc717a944144e72f7
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the PDF structure strongly suggest an attempt to redirect users to potentially harmful content or phishing sites.

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://nomylo.ru/pbw?utm_term=scholastic+reading+comprehension+grade+4+pdf PDF link annotation
    • https://sidujojuwizubal.weebly.com/uploads/1/3/4/5/134587716/dijatenadisamob.pdfIn PDF document text
    • https://xivuseto.weebly.com/uploads/1/3/4/3/134316593/5219189.pdfIn PDF document text
    • https://zedaluridafam.weebly.com/uploads/1/3/4/4/134464222/735839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452173/normal_5ff1ffc29af36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_6063903db0ef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_605ef68f8b2c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_606148048ea9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kolasotosexu.pbworks.com/f/rupoxovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aad43cb-961e-47c6-b7e5-3234d04fc5d9/how_to_use_the_philips_avent_microwave_sterilizer.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/how_does_implied_volatility_affect_option_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347db475-9fe3-4432-bbab-0fdd97d950a6/fosipefiludorojasujifeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbdd8686-a9a2-4e39-8244-b69c54fd0b83/pipanixakobebununajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d58e9ed-97dd-402e-a29a-ecfb79bce2a9/how_do_you_program_a_universal_remote_to_a_rca_converter_box.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/w/file/fetch/144573390/vizio_sb3651-e6_review_cnet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32794b47-be38-4989-9cfe-d512e17ce4aa/rukiduwadizore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c78b18a-9988-41dd-ae8d-ef40d8a1d22c/coding_the_matrix_philip_klein.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4872af3-44da-4c2c-91a9-045b1156e049/bipatavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff2ac2e0-95b2-4b37-a114-9edb461b2b9a/medetijegal.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/f/vivaldi_concerto_in_a_minor_3rd_movement_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ca0c8a-51b4-4526-a75e-a5f0d2710e0d/do_all_honda_odysseys_have_transmission_problems.pdfIn PDF document text
    • http://munonoraze.pbworks.com/w/file/fetch/144562245/how_to_update_audi_mmi_sd_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2439a3-fc8c-4db8-b694-67e1990b3ad5/warriners_english_grammar_and_composition.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/144500922/52447043320.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_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 5760 bytes
SHA-256: 23625e01191cb4f392a471bc8d8d83797139ce662220e72199eff7afb63746a5
font_01_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 10388 bytes
SHA-256: 073a0647f6732a4523b3a839a39a62a862442254f8867a8c6bf89d54fcd3920a