Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbd43917c4785a0…

MALICIOUS

PDF

122.2 KB Created: 2021-02-14 19:36:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2939459f1b697ef6dc8ddcb60567e332 SHA-1: 6eee0b80829d8ab2506ad15fb83cd74422a91757 SHA-256: 5dbd43917c4785a093b6396e35dff6ede224d680a4d236cd2a11118580f0ecdb
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://baarspo.ru/123?utm_term=ford+galaxie+500+xl PDF link annotation
    • https://cdn.sqhk.co/sipebililofo/igix65D/tinkle_tonic_petco.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/gihJjdC/snows_bbq_lexington_tx.pdfIn PDF document text
    • http://myimperfectmomlife.com/66200670589qva3z.pdfIn PDF document text
    • http://tevoriveterusof.22web.org/37409145982.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/dulilewemidixiyc4ej.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/bieOLgc/dutipepimomewudirusomalur.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/dwii1ii/34310925921.pdfIn PDF document text
    • http://robot3.site/14249466012oug1s.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/NkVgddq/fegazi.pdfIn PDF document text
    • http://ekzo-fruit.ru/wooden_block_puzzle_classic63lhm.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/hjW5Hpa/mupofaki.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/Uf1iigj/71895793877.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/elghdTh/dixan.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/51Sjh41/download_video_from_instagram.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/welanisowari/afsar_full_movie_djpunjab.pdfIn PDF document text
    • http://xegebasitez.rf.gd/35850509451.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/bioshock_infinite_review_game_informer.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/35427781115.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_off0001a17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A17C 5104 bytes
SHA-256: 5075812e595db3b71359d1bd41175255d585b43ac2c00453a127b9ff67695cdb
font_01_sfnt_off0001b2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2F2 11980 bytes
SHA-256: 4bbaed17b5c3ff71a63803f0ac2fe58e0f36abb14b11e7bee9de2db3b9628b9c

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