Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa49182853bc8b23…

MALICIOUS

PDF

89.7 KB Created: 2021-05-18 13:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd52d967060f47f11c45374fca4b06fa SHA-1: 9ac8c33c79ed55167b2a6cbce56008564a5cf482 SHA-256: aa49182853bc8b23a96e5cbab35930e6dce9a27a58a3b9829e8c4a4832811c7e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to obscure the true destination. The presence of a link related to 'gta 5 apk free download' suggests a lure for users seeking pirated software. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan.

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://botokaw.ru/strik?utm_term=gta+5+apk+free+download+for+android+22mb+build+your
    • https://saworajopasu.weebly.com/uploads/1/3/0/7/130775294/lizuwen_moborilegowuv_returadusisexi.pdf
    • http://rexapeduke.66ghz.com/54071941443.pdf
    • https://muropezevoride.weebly.com/uploads/1/3/4/5/134514904/kosuxanaxi_tajajel_vutasiwofof.pdf
    • https://cdn-cms.f-static.net/uploads/4470835/normal_6028ee316cb54.pdf
    • https://cdn-cms.f-static.net/uploads/4415045/normal_60119429bad0f.pdf
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5fda6ce56fcc0.pdf
    • https://static.s123-cdn-static.com/uploads/4419191/normal_5ff56453a56ee.pdf
    • https://zuvigopujipo.weebly.com/uploads/1/3/0/9/130969218/dozopepifodipe.pdf
    • http://dotuzodozo.22web.org/kitchenaid_food_processor_manual.pdf
    • https://tefegori.weebly.com/uploads/1/3/1/6/131637168/2142826.pdf
    • https://cdn-cms.f-static.net/uploads/4370080/normal_602a3e290da67.pdf
    • https://bazewubudib.weebly.com/uploads/1/3/4/7/134731154/6371568.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tezude/knowledge_work_systems_kws_definition.pdf
    • http://nufewaruxemo.epizy.com/ayyappa_bhajana_songs_telugu_free.pdf
    • https://s3.amazonaws.com/gadumagabusodel/learning_colors_in_english_worksheet.pdf
    • http://vigiraporonom.rf.gd/fumunagepawagiwux.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109aa.bin
c0ab53968fea0d0f5df34ed5d5ce9efa9a129f88ad33b0bb8701e761778e85b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 5692 bytes
font_01_sfnt_off00011d20.bin
a0652413aaa1c11c8956ba357ce53801ef144e1c8891f6f6ae6e03e28dbf917c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 10892 bytes
font_02_sfnt_off00014293.bin
441cd8e52334e54c69492f1e9634879a2f51cab13b55c76d7f83b9cb9c14f1dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14293 16496 bytes

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