Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f183076cb391cd…

MALICIOUS

PDF

77.6 KB Created: 2021-03-05 06:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a54781e0f95ef3104e600367cdf0cd9d SHA-1: bad4f4a16e3165a0b3c2533fe21d33833491b4ec SHA-256: d7f183076cb391cd24088db9858db2e4fc11cd1eeed19c6072bc2bb74ae70e31
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, specifically as a phishing trojan. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with the primary suspicious URL being 'https://xezojetit.ru/strik'. While no scripts were explicitly extracted, the PDF structure and the high number of embedded links suggest an attempt to redirect users to potentially malicious websites, possibly for phishing or malware distribution.

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-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://xezojetit.ru/strik?utm_term=how+to+determine+your+philosophy+of+education
    • https://cdn-cms.f-static.net/uploads/4384143/normal_603a0421091df.pdf
    • https://cdn-cms.f-static.net/uploads/4461763/normal_601e406678864.pdf
    • https://cdn-cms.f-static.net/uploads/4418984/normal_5fd635e221b52.pdf
    • https://cdn-cms.f-static.net/uploads/4465263/normal_602166fd2ddfa.pdf
    • https://static.s123-cdn-static.com/uploads/4391893/normal_5fd0847707097.pdf
    • https://liwufodabex.weebly.com/uploads/1/3/4/8/134872973/gizatufoweg.pdf
    • https://cdn-cms.f-static.net/uploads/4375351/normal_603a2419bb2ec.pdf
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/1032918.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_ad40cb3b88b24064a76916d56458e150.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fb6a416f-fc5a-428a-94bf-84c8e7cf480f/being_and_time_martin_heidegger_summary.pdf
    • https://uploads.strikinglycdn.com/files/09e92a46-32c8-42fc-8c15-982784f40097/what_kind_of_bugs_are_there_in_arizona.pdf
    • https://uploads.strikinglycdn.com/files/28661aa2-aa8e-4513-95f3-b7f089e22d79/axiom_61_dimensions.pdf
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_539633e62fb242c4a215b1be0ef2b9ad.pdf?index=true
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_c587f4d9bd21407c85ca3432deb2a02b.pdf?index=true
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_7669a72d430b4050bbf2fe08e21c4b84.pdf?index=true
    • https://uploads.strikinglycdn.com/files/27291e2d-7198-470b-b95c-a6b4fb039581/15728905390.pdf
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_d7e9e3be23f8420dabab41333b5c5ab9.pdf?index=true
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_5899946f751c4eb2b1424175eedbd035.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4e1aaa6f-6f57-4778-b09c-f6e3ca778e32/komalinu.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_off0000e24f.bin
202bb98523a3b4fcbc87fb6272473777ac247153c546cd4f5c9628235d53ea78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 5432 bytes
font_01_sfnt_off0000f4af.bin
1162c5581bae78218320b42ce6e0b8f2d930f9d6f08ba63b94b18de59f349d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 10616 bytes
font_02_sfnt_off00011908.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 4324 bytes

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