Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa0973524fc7d3a…

MALICIOUS

PDF

91.3 KB Created: 2021-05-17 18:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a4422ab970c061894053d580179329e7 SHA-1: 292a74119eb2d58cabfe2e53d02d7c711f849d33 SHA-256: 8fa0973524fc7d3afc0ab9028811486483cffb67dd814591ec737e2a74058298
126 Risk Score

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 domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to game-related content, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://zajinet.ru/strik?utm_term=metro+2033+chapter+4+defense PDF link annotation
    • https://cdn.sqhk.co/bomenojosa/yiehjBl/17838053073.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/duKfHhf/tiny_dice_dungeon_monsters.pdfIn PDF document text
    • http://myfavoritesun.xyz/2767108016389zj4.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/c_programs_download.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/binidizu.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/lRggCXr/gun_strike_hack_mod_apk_download.pdfIn PDF document text
    • http://chambre.xyz/48335224824hhyy2.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/debominazawoguzofog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467027/normal_603fec8cadab2.pdfIn PDF document text
    • https://manumuxalobo.weebly.com/uploads/1/3/5/3/135387638/51a2ff4f.pdfIn PDF document text
    • http://checkmyscore.info/736457615245rsvh.pdfIn PDF document text
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/novikijiluz.pdfIn PDF document text
    • https://sevisexabokiro.weebly.com/uploads/1/3/1/6/131637038/xuximoji-dosatoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461780/normal_5fcfec113a512.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumebesatupa.epizy.com/bixurakiborineza.pdfIn PDF document text
    • http://tivusanezidiv.rf.gd/acute_myeloid_leukemia_2020.pdfIn PDF document text
    • http://biwipekimati.rf.gd/97478803602.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/cuisinart_ss-700_parts_diagram.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000eb34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEB34 10596 bytes
SHA-256: f191556667241c056cef008a7e25a530cd63222480b52d5a28ee24bdb007e576
font_01_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 5744 bytes
SHA-256: 8dad58eb8c1ed76abc51b02c465d34ebac98b4037a068b842c4efda34166cc84
font_02_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 11652 bytes
SHA-256: e61ea1d184081f3e6489e2458d3e6d8f02f18f4931e52b6cc92ea6fa898c50f2
font_03_sfnt_off000149d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D1 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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