Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b1d880062948a6…

MALICIOUS

PDF

89.5 KB Created: 2021-03-21 00:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4c38c3f8da863b303439c57d3bc5f66 SHA-1: 1cd74e5c6620c6c914455fa09b1e2b598d37c5c8 SHA-256: 71b1d880062948a635116a87261464bdad976c38f30de964095511534abbf036
156 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing or malicious document, indicated by the ML classifier and ClamAV detection. It contains a large number of external links, with one heuristic specifically identifying a "PDF link farm" likely intended for SEO manipulation or to distribute further malicious content. The document body, though heavily obfuscated, suggests a lure related to an alarm manual, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=monitronics+alarm+manual
    • https://cdn.sqhk.co/juvowisire/ahhjgX5/nanozudejusok.pdf
    • https://cdn.sqhk.co/poronujefino/idhbAZD/faxapizijesokexufilopaf.pdf
    • https://cdn.sqhk.co/zujubokave/gfjfqge/solar_system_formation_the_planets.pdf
    • http://bijipejip.iblogger.org/54630097231.pdf
    • https://cdn.sqhk.co/walamalesumi/ghigGzX/81597784047.pdf
    • https://cdn.sqhk.co/xafiguzi/hFgfiiU/niborapezivar.pdf
    • https://cdn.sqhk.co/nokowifupe/jamJWid/abalone_shell_dream_meaning.pdf
    • https://cdn.sqhk.co/rarukaboz/WpLzjiG/tape_it_up_hack_apk_mod.pdf
    • http://dubulus.iblogger.org/mapave.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/legapatatezisa/netflix_expired_meaning.pdf
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_f16877e43d1646c4b9b888ce677a5721.pdf?index=true
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_b6eb4d64c2c94c249a74b090c34f85a0.pdf?index=true
    • http://namopidud.epizy.com/lesus.pdf
    • https://s3.amazonaws.com/padosumifubobo/79477697238.pdf
    • http://menivafanar.epizy.com/roman_numerals_1_to_1000_chart_download.pdf
    • http://filazit.epizy.com/mammogram_guidelines_acr.pdf
    • http://wanuzenupikow.rf.gd/6007461649.pdf
    • http://pititonekeget.epizy.com/why_is_my_hp_laptop_saying_plugged_in_not_charging.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/nijozanafokesuxotejote.pdf
    • http://jabenesejamuji.rf.gd/vukeraditinakabu.pdf
    • http://jigaxobipufita.epizy.com/kuneve.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011257.bin
84e9e455b74dce789e6836e3743449fff7086c2459f22b2ed4838d3a48876b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 4952 bytes
font_01_sfnt_off00012321.bin
131a9d494990c6ced85c62f0e2c6433017b2d86ae716032c3ac82ca9d25f87be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 24304 bytes

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