Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a87c8db5dd26c93…

MALICIOUS

PDF

62.5 KB Created: 2021-01-21 13:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9ace13d7b39a1688a8a5a51f8bc44c37 SHA-1: 2d7863070a9efa97adeabcdf7ff167d55b041931 SHA-256: 6a87c8db5dd26c938f146a989643dc1e3aee0e11e84ea29869d65f55d5ce1e6f
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Wray school district staff', suggesting a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=wray+school+district+staff In PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/8511723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477409/normal_5feb7b5c775fd.pdfIn PDF document text
    • https://site-1177739.mozfiles.com/files/1177739/free_coloring_page_puzzle_piece.pdfIn PDF document text
    • http://nilofebep.iblogger.org/antietam_licensed_battlefield_guides.pdfIn PDF document text
    • https://site-1175494.mozfiles.com/files/1175494/bevars_naa_songs_dj.pdfIn PDF document text
    • http://rofavaxob.iblogger.org/definicion_de_metabolismo_basal.pdfIn PDF document text
    • https://site-1178100.mozfiles.com/files/1178100/new_kjv_bible_apk.pdfIn PDF document text
    • https://wixokaregojes.weebly.com/uploads/1/3/2/6/132681478/purobavalabuvelob.pdfIn PDF document text
    • https://site-1171150.mozfiles.com/files/1171150/national_rowing_championships_sarasota.pdfIn PDF document text
    • https://site-1178386.mozfiles.com/files/1178386/pako_car_chase_simulator_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_5fdba0f3e3503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_5f91c80f560c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujonejetas.epizy.com/24158921399.pdfIn PDF document text
    • http://kovejenipo.epizy.com/hiking_guide_malaysia.pdfIn PDF document text
    • http://bixogonabu.epizy.com/light_chain_amyloidosis_guidelines.pdfIn PDF document text
    • http://bonubenevutura.epizy.com/pathogenic_microbiology_study_guide.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_off0000b9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EA 5224 bytes
SHA-256: d963302ee42bf03c0b00686935cb4a88048e1d749de2041f94220bb5b012aa31
font_01_sfnt_off0000cbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB9 9868 bytes
SHA-256: 4b080d343baf98d7b1cb59af4e555bf3c1335bb28cfaed509fe7a7bc6d7a173d

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