Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a4d2d39ed30a05…

MALICIOUS

PDF

80.2 KB Created: 2021-06-09 03:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92a66e2d29a6ffbff376e96cbd639344 SHA-1: c24d238370fef859e30ebc260272a3100d819ead SHA-256: 38a4d2d39ed30a05c8262c62e7ee397d94d568a1e25e9532be5f11827f9ff38a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains a mass of external PDF links, with the primary malicious URL being https://nipisod.ru/123. This suggests the document is part of a link farm or phishing campaign designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/123?utm_term=serenissima+informatica+lavora+con+noi
    • https://cdn-cms.f-static.net/uploads/4428035/normal_60141b2477d95.pdf
    • https://xijoxipuxob.weebly.com/uploads/1/3/4/7/134704834/4925225.pdf
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/biwuwowuduvugagizop.pdf
    • https://static.s123-cdn-static.com/uploads/4462362/normal_5fe4de0a62606.pdf
    • https://sixevajerav.weebly.com/uploads/1/3/5/3/135341720/1691170.pdf
    • https://pobanofesu.weebly.com/uploads/1/3/1/3/131398475/nurodexoxofiwiwad.pdf
    • https://datodorigagage.weebly.com/uploads/1/3/4/6/134697486/c82f0e.pdf
    • https://suzilevovovo.weebly.com/uploads/1/3/4/3/134310132/028a886886a193.pdf
    • https://cdn-cms.f-static.net/uploads/4454541/normal_5fd1d20d88e62.pdf
    • https://cdn-cms.f-static.net/uploads/4494883/normal_60590d8d99527.pdf
    • https://cdn-cms.f-static.net/uploads/4426080/normal_603a03175905e.pdf
    • https://wezoduvum.weebly.com/uploads/1/3/4/0/134096245/3019229.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b4c41f7a-da2d-473e-8a38-526998c5b19c/16147126697.pdf
    • https://uploads.strikinglycdn.com/files/7779c16a-ed1a-42d4-9262-c98ed76a469c/how_to_replace_typewriter_ribbon_smith_corona.pdf
    • https://uploads.strikinglycdn.com/files/2179dafa-5f36-4155-a780-9f21b9a28020/35490266076.pdf
    • https://uploads.strikinglycdn.com/files/cf6f7da1-1953-4323-b543-15d70bb6fdae/incentive_plan_template_excel.pdf
    • https://uploads.strikinglycdn.com/files/40287efd-025d-487e-ba35-943208e58720/how_to_start_an_essay_ideas.pdf
    • https://uploads.strikinglycdn.com/files/2d5075a1-f9bc-468c-a623-971919c9769d/jigitubunapaw.pdf
    • https://uploads.strikinglycdn.com/files/cd6b9b37-d651-4dc7-9b05-2af3a48af697/lewubusotizi.pdf
    • https://uploads.strikinglycdn.com/files/7cef12c6-8f38-4cb4-a07b-dcfcfeec1515/complexity_and_contradiction_in_architecture_full.pdf
    • https://uploads.strikinglycdn.com/files/2eff66d9-571d-432c-9e21-31bdf796c101/in_praise_of_shadows_junichiro_tanizaki_summary.pdf
    • https://uploads.strikinglycdn.com/files/4a12a24c-e2d3-499c-9f80-2b347f84fad9/mobile_legends_mod_apk_2019_unlimited_money_and_diamond_android_1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb70.bin
1a199688ee5e3edae6fe3e81a27aee00e2af55848163de6ce069c86f9834c353		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 4980 bytes
font_01_sfnt_off0000fc35.bin
c59786f42ebe3cb1e6300759828342cf9b56436acd78cf149dac6706a70732d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 12008 bytes
font_02_sfnt_off000123a2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 4324 bytes

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