Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3ebe80a18363be…

MALICIOUS

PDF

101.3 KB Created: 2021-04-04 10:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a073a16eb42d8c01a9c7a21d3a9fc46 SHA-1: 7ea2261f8a631fbfd9c0340b3f14daff608e5060 SHA-256: 7f3ebe80a18363be62482f5596d5e1520e4d3dad10264e92a6b98e4bb7893d5f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to drive traffic to various websites. One prominent URL, 'https://zajinet.ru/award?keyword=atp+doubles+rankings+pdf', is directly embedded and likely serves as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=atp+doubles+rankings+pdf
    • https://cdn-cms.f-static.net/uploads/4463287/normal_6050fd471b9ae.pdf
    • https://cdn.sqhk.co/kefofepobam/ihgfgii/laroledeluvaxegetu.pdf
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/a295fce727.pdf
    • https://static.s123-cdn-static.com/uploads/4370540/normal_600625d329a85.pdf
    • https://cdn-cms.f-static.net/uploads/4450148/normal_60605293baefb.pdf
    • https://static.s123-cdn-static.com/uploads/4486042/normal_6004cd93cdb77.pdf
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/c160e43a4d57.pdf
    • https://static.s123-cdn-static.com/uploads/4456379/normal_5fe56459ac1c2.pdf
    • https://cdn.sqhk.co/naritiba/SGStbgg/http_consumer._huawei._com_en_user_guide.pdf
    • https://cdn.sqhk.co/womalakifaxa/QhbRjed/jetaudio_music_player_full_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4418590/normal_6025197da632a.pdf
    • https://fexedewikefitug.weebly.com/uploads/1/3/2/6/132681233/dataguji.pdf
    • https://cdn-cms.f-static.net/uploads/4459628/normal_60143c3e56252.pdf
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/5551253.pdf
    • https://wavamabixalovag.weebly.com/uploads/1/3/4/5/134525364/zuzaged.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_6c2dab5b32c24043b3c9677916eebb69.pdf?index=true
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_96d8624aaded4e13bccbbd543bb533ac.pdf?index=true
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_08e6756e369b45dc89268015ca55e631.pdf?index=true
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_4473f3c5324a49bea21e56bd4b25d969.pdf?index=true
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_1413ba7fb57541f9a9e14ebfb82664c2.pdf?index=true
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_751f3f60552749459d1dc65a3cb45822.pdf?index=true
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_b43a8a5671e244e1a0828f83384d9ba4.pdf?index=true
    • 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_off00014a1a.bin
29f7051f56db54f48b05c20db888a2ea24b812a441d2c40a35c604dfc279bdd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1A 5404 bytes
font_01_sfnt_off00015c88.bin
e098e319dcc2e7c75e7eec9a516ccfc6f384bf956cdf01e29ec9a48b6d6f6b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C88 13828 bytes

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