Malicious PDF — malware analysis report

Static analysis result for SHA-256 53eb4c807dad794f…

MALICIOUS

PDF

74.7 KB Created: 2021-05-19 11:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a88d2db5307f872ed723a382dcc7c15a SHA-1: b5a017e71abdb68d9ea3b672178db883aa32a040 SHA-256: 53eb4c807dad794f9dbea89a847658118293d8b124c5a0e4bb8aad38e2cd22f6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The document body, though partially corrupted, includes a URL that appears to be a lure for users seeking information on adjusting a chainsaw carburetor, likely to mask the malicious intent.

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
  • 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://botokaw.ru/strik?utm_term=how+to+adjust+carb+on+husqvarna+240 PDF link annotation
    • https://vipamabukaxeban.weebly.com/uploads/1/3/0/8/130874648/jobowa-wenisosorev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_6044fda1a35f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365553/normal_5ff906aa55277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_602760a7bc6bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408706/normal_5fcc912aa4d41.pdfIn PDF document text
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/nugawaboro_jigugagetofesom_sawoj_fuwutewu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496148/normal_5ff7828d9bb63.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/1618947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_60600233ef8d8.pdfIn PDF document text
    • https://zokevuwokonumez.weebly.com/uploads/1/3/4/6/134682223/22b3712f.pdfIn PDF document text
    • https://kokesekodabese.weebly.com/uploads/1/3/4/0/134012443/3284835.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/8488965.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451019/normal_6003def53c683.pdfIn PDF document text
    • https://tiwozujipi.weebly.com/uploads/1/3/5/3/135317022/solosav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/868c7b8a-b65c-4f3a-9cac-ffedaa898fbb/sub_zero_550_ice_maker_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96391fd1-9c59-4878-8398-6c94fc9f5209/zabumonobak.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/bodmas_questions_and_answers_for_class_7.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/83651001708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ef84f0-5dc9-43bd-9ed9-c027ae279195/clep_english_composition_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/chult_hunt_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/english_test_for_grade_5_with_answers.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_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 5812 bytes
SHA-256: 399c4fd6910cc9446ab8a75aa2613ce71b88454ef378739764d283d5ec10a5bb
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10552 bytes
SHA-256: 805a3716248916c2b4b8531f8d0fc04b912cdea9fe263b940da9ead8864ea6c0

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