Malicious PDF — malware analysis report

Static analysis result for SHA-256 504788a5e8d5acf3…

MALICIOUS

PDF

66.5 KB Created: 2021-03-08 13:17:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f83fdb885d0cfcb0598f3269f7bef6e8 SHA-1: 972ead52559d01bfdcf529e5a37a5575517543ed SHA-256: 504788a5e8d5acf3fdfc7e0ee8e85abdc54bd05baa832693fcbb5a1a07771b9a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF SEO Link Farm' heuristic. One of the primary external URIs points to 'pelibifir.ru', which is likely a phishing or malware distribution domain. The ClamAV detection and ML classifier also indicate malicious intent, specifically flagging it as a phishing trojan.

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/wix?keyword=compare+a+human+and+chimpanzee+skeleton+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4474979/normal_60329fe610981.pdf
    • https://static.s123-cdn-static.com/uploads/4498978/normal_5ffac2babc708.pdf
    • https://cdn-cms.f-static.net/uploads/4466175/normal_602fa046eaa61.pdf
    • https://cdn-cms.f-static.net/uploads/4448539/normal_601eaa717a0ee.pdf
    • https://static.s123-cdn-static.com/uploads/4456685/normal_60056361288f0.pdf
    • https://cdn-cms.f-static.net/uploads/4391636/normal_60329f58c91a2.pdf
    • https://cdn-cms.f-static.net/uploads/4387430/normal_6031262134397.pdf
    • https://cdn-cms.f-static.net/uploads/4368996/normal_602c121d5f76d.pdf
    • https://static.s123-cdn-static.com/uploads/4494866/normal_6004751ad7cdb.pdf
    • https://cdn-cms.f-static.net/uploads/4405946/normal_600fb0ce56fad.pdf
    • https://cdn-cms.f-static.net/uploads/4413973/normal_60297f95436aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_c87bd50301ed4316a0fbbac22f93db2d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/84dfb021-9c46-441e-80f6-68844562fab2/35376419590.pdf
    • https://uploads.strikinglycdn.com/files/19eed231-95ee-47cb-9b2b-302204b288a4/masegu.pdf
    • https://uploads.strikinglycdn.com/files/83f3c0c7-5910-421a-a7f4-a0d064efd06f/36290274050.pdf
    • http://ponenasese.epizy.com/answer_to_everything_synonym.pdf
    • http://tejusadesivuti.epizy.com/wuxazafafonanudatipin.pdf
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_3df6b0da84f247689c7605e15c43f2a3.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_off0000c8a2.bin
a79732fa501e17f804289e4fc0eb3d3f5c7817129680a4bc1c6a48f1e1492f2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A2 5424 bytes
font_01_sfnt_off0000dafb.bin
c23418fcf9aee0cff2f4b721c9aba1b202bed3e59e3611cd36183c54b893b453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 9848 bytes

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