Malicious PDF — malware analysis report

Static analysis result for SHA-256 0177b62871efb44e…

MALICIOUS

PDF

80.8 KB Created: 2021-05-15 20:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6b79ed99d2480dbb7da2e1aa6421f351 SHA-1: 127e2897f84eb0f0ee7d192ae7b39959ea7caf05 SHA-256: 0177b62871efb44e4935b210ee71177d906ee28a09be150e5d4d1cb293cee42c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/strik?utm_term=any+nails+salons+open+on+sunday PDF link annotation
    • http://trikotoria.ru/nolirarhvxgy.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/946320.pdfIn PDF document text
    • https://nomomiwadij.weebly.com/uploads/1/3/3/9/133997716/19167.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/8352798.pdfIn PDF document text
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/ebb993b43e918.pdfIn PDF document text
    • http://presalle.xyz/10567548443jj2d4.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/nedijowewoded/beeruva_full_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/likasaloxowerozamapojevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ddd379-db9e-4f18-a9d8-5cd671289e7e/torozobaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9adaeab9-c460-46d4-bcc6-b8518bd7d5d7/dell_u3415wb_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/how_to_self_clean_jenn_air_convection_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22fe9f8-b12d-4c3a-81b7-8100eb6d4723/what_kind_of_oil_does_a_honda_accord_take.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/siwukukavufubepenegadef.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/guided_meditation_with_female_voice.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/entry_level_mechanical_engineering_jobs_denver_colorado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1106f31-a4bb-4106-9146-c6175e7331d8/2000_ford_focus_haynes_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85f83bd-9124-4bb1-8acb-5a59198ee6bc/87619290521.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/84350990570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30752058-771f-4246-bb7a-17fc7ecfb8e7/wimasizodazibudopukaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2b1ae2-1bf6-4c4b-a4b2-a2411ac41508/xonafamobinijodane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5c2543-ce52-41c2-ba76-d40c366d186b/anti_hbs_test_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3c11ca3-a8b6-43ea-a018-971929d5b74d/8562208855.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/pokemon_revolution_online_hoenn_elite_4_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d36b09-4a1f-4789-8803-11c1d7eb5bdc/ameristep_2_man_ladder_stand_accessories.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_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 4948 bytes
SHA-256: ae2e58eb06a61ecda975f342fa035336e0617cebe54493c563b3f799afb47c12
font_01_sfnt_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 11328 bytes
SHA-256: dc7a23c949672de9bf9f52e0c67c284f811eb9208d089e7334aa4d6e2e60508a
font_02_sfnt_off0001200e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 16344 bytes
SHA-256: ed45a24507f18daeaf6b6e9cac20235e9e43bed88bc2d44b7621eff085e31190