Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89c9f4833451d14…

MALICIOUS

PDF

90.3 KB Created: 2021-03-14 23:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 205f6f308946bfa9b638ce87bfcfe17a SHA-1: d40b4e282a33a434ca9a4eb7fdc1b44cfd1e0f5d SHA-256: f89c9f4833451d14f48cde45c1d39834e2be848540f3db08a7793eb7255ef9b4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, many of which are likely part of a link farm or SEO manipulation scheme, with one prominent URL being https://vilenefex.ru/wix?keyword=rigid+motion+transformation+worksheet. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and link farm suggest a phishing or malicious redirection attempt.

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://vilenefex.ru/wix?keyword=rigid+motion+transformation+worksheet
    • https://cdn-cms.f-static.net/uploads/4478398/normal_601042815aed2.pdf
    • https://cdn-cms.f-static.net/uploads/4453528/normal_6023bad8c3de3.pdf
    • https://gibejeki.weebly.com/uploads/1/3/1/4/131438187/vuzurixogijopatem.pdf
    • https://gimisezijumini.weebly.com/uploads/1/3/1/4/131453276/738d5fa6ca0023.pdf
    • http://tusuvopub.22web.org/obligations_and_contracts_jurado.pdf
    • https://cdn-cms.f-static.net/uploads/4496577/normal_602b68c018f17.pdf
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/fajen.pdf
    • https://tilakajunobeka.weebly.com/uploads/1/3/0/7/130739719/1acc7a10080.pdf
    • https://nodarato.weebly.com/uploads/1/3/4/4/134487471/5913581.pdf
    • https://xakivemo.weebly.com/uploads/1/3/0/7/130739368/sepetuteto.pdf
    • https://gizewafimeferem.weebly.com/uploads/1/3/4/5/134578419/7323383.pdf
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/mewef-zunoguporuka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2a30a3dd-481c-4f14-8f2c-5ecddb318fdd/nlt_holy_bible_giant_print.pdf
    • https://uploads.strikinglycdn.com/files/24d5c40f-2e08-40ae-9fa1-c65e77c990e7/87473132006.pdf
    • http://sopokodage.epizy.com/tutorial_camera_raw_cs6.pdf
    • http://nejovafejasujob.rf.gd/bisizerapatofonimigovef.pdf
    • http://gijufebevavudep.rf.gd/87930934312.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_off00010cee.bin
9352111dfdac69c3b20bb955d84163d071bcee554fb20d963fa6779f3a3e34f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 5452 bytes
font_01_sfnt_off00011f68.bin
988f05caa6fe51c027d54db02ab6905e9c68452e2e1a303af9bb7784d6bf7b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 11460 bytes
font_02_sfnt_off00014691.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14691 16092 bytes

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