Malicious PDF — malware analysis report

Static analysis result for SHA-256 38262c62c79a2f20…

MALICIOUS

PDF

76.1 KB Created: 2021-02-16 21:35:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a5b06181e13fd58fa97fb86f5a1f33ab SHA-1: aee121bff7d630c195deb7fd5c2b19a1a67cfca8 SHA-256: 38262c62c79a2f208c2e0fa93f295c48deeca09095242bd0a8a862911faf29dc
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to dog training devices, likely a lure. The presence of numerous links on disposable hosting further supports a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=what+is+the+best+dog+training+device In PDF document text
    • http://instup.xyz/3330151478gnaa.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/Hb4jjAV/better_camera_mods_1._15_2.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/NX9hggd/21392062834.pdfIn PDF document text
    • http://milanomoda.site/guess_the_emoji_movie_level_348bsir.pdfIn PDF document text
    • http://swiss-gear-top.xyz/21819109677dst8u.pdfIn PDF document text
    • http://fsfsfd.xyz/pokemon_crystal_breedingx49gm.pdfIn PDF document text
    • http://cmbclientes.com/55697994377ii5xq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_6022cba2d5e81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_6025caa7c596a.pdfIn PDF document text
    • http://losqutoq.online/boomerang_movie_quotes_strangetkm2c.pdfIn PDF document text
    • http://medway24.com/skyrim_requiem_conjuration_guidefp4r5.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/ejdUogi/gezusofobuxinu.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/hjeSbTm/35735304757.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekarenov.rf.gd/viwifopufatod.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/pijaraxilo.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/article_of_association_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/student_voting_ballot_template.pdfIn PDF document text
    • http://butevagowug.epizy.com/66678584236.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_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 5380 bytes
SHA-256: 32f6a5e87b340f2483c1ef411edb030fdc24d51920039e5aa1f82c095ac2d7e1
font_01_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 10184 bytes
SHA-256: f1cf3e60f46732ff997ea2e9a5b824e66152098ded8083b7e28307549d9edc21

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