Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a165a956f78e6ab…

MALICIOUS

PDF

76.6 KB Created: 2021-03-15 18:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2767a670d4b5176a0bfd676f08e72ba9 SHA-1: b6186b7cd94c181e777af36ac94781cacad3a49c SHA-256: 0a165a956f78e6ab9664802a42125b760d714718c04380678b8fa988cd8e820c
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Java recursion questions and answers' to direct users to these malicious sites. The presence of malformed streams and external URI firings further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://seumenha.ru/123?utm_term=java+recursion+questions+and+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445326/normal_5ff5cc4eaace6.pdfIn PDF document text
    • http://rent-nout.site/import_excel_spreadsheet_into_access_reportsmct8.pdfIn PDF document text
    • http://povar2020.site/tuwanigoxalapokukoby3h6g.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/he8hed7/bitcoin_wallet_app_android_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/jjhiXew/capitalism_vs_communism_during_the_cold_war.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369914/normal_5ff808479b8ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_6049149f8d470.pdfIn PDF document text
    • http://podjem2.club/5946242268cam67.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/h9hglgd/59766455173.pdfIn PDF document text
    • http://wgathering.org/98208191356cbwhn.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/jfih3gc/on_the_q_t_crossword.pdfIn PDF document text
    • https://cdn.sqhk.co/bozogekeji/icjgthc/revif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501208/normal_6023c3dda2470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465252/normal_5ff807e42d6b6.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/d6665a1c-c1e7-45d6-91ee-085627399b88/golf_buddy_voice_2.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/why_my_ac_is_not_cooling_car.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/76390424705.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/70999238770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc77ae03-980f-4a63-bb4c-372bce3881ec/how_much_is_an_eyelash_extension_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2eec3f-9c4e-4175-8d02-570e60919188/lenijez.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 5168 bytes
SHA-256: 9ff5601ea5557c1dd3592bdc236a302b886d6c26e4288adeaf986b14b27daa8d
font_01_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 10868 bytes
SHA-256: 43ce8aa8c428fa2b089acc7c9dffc58c8b55c8519fee10e0389d27cc8d9526e7

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