Malicious PDF — malware analysis report

Static analysis result for SHA-256 63008f2742c5054b…

MALICIOUS

PDF

73.8 KB Created: 2021-05-15 04:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 316a5b83d3799e70b189e4f834cdeb4e SHA-1: 7477057037b075ce872b028a2c43f9102507ea24 SHA-256: 63008f2742c5054b06e11698d3799e9efea0f439287d52fe7e92ef29a8067ce0
156 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, appears to be related to search engine optimization and contains a URL that could be used to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=2012+toyota+highlander+transmission+service
    • https://cdn.sqhk.co/fudimesa/jTVD65W/generation_z_online_shopping_statistics_uk.pdf
    • https://cdn-cms.f-static.net/uploads/4488806/normal_5fd8bf8186a13.pdf
    • https://cdn-cms.f-static.net/uploads/4413570/normal_60605ac58affb.pdf
    • https://cdn-cms.f-static.net/uploads/4386824/normal_5fd7a7e665a72.pdf
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/nibuvex.pdf
    • https://wukakokusaz.weebly.com/uploads/1/3/0/7/130739200/2537481.pdf
    • https://kixuvatapowow.weebly.com/uploads/1/3/1/3/131383305/1738546.pdf
    • https://cdn.sqhk.co/wudawagirus/djijihf/60773975485.pdf
    • https://static.s123-cdn-static.com/uploads/4461250/normal_5fcb5c1043623.pdf
    • https://cdn-cms.f-static.net/uploads/4424027/normal_6054b8bf11e09.pdf
    • https://vadanuburizupi.weebly.com/uploads/1/3/4/9/134901301/4587180e59d1a25.pdf
    • https://jimiwijir.weebly.com/uploads/1/3/4/5/134525211/sunekexerawom_falumo.pdf
    • https://static.s123-cdn-static.com/uploads/4472501/normal_5ffbaeccb45e7.pdf
    • https://firudofomupavu.weebly.com/uploads/1/3/1/3/131384713/pidusab.pdf
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/05711fec.pdf
    • https://static.s123-cdn-static.com/uploads/4370071/normal_5fdd5c4e8f658.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kotidox/what_is_the_best_electric_type_pokemon_in_emerald.pdf
    • https://s3.amazonaws.com/lezopobigeza/pemovovikanuwufazi.pdf
    • https://s3.amazonaws.com/genukopapovixo/lekuku.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_off0000e361.bin
45c7c3b7789a59cee3eb03ab7cca88e88381aca905bbd06096fa7eb397bfef97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 5744 bytes
font_01_sfnt_off0000f6df.bin
996cbe7748ec71694d8bdd6500258c969542544a69a5971cb1bb2092819d54ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 10220 bytes

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