Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67b894a4ddbc0ba…

MALICIOUS

PDF

79.0 KB Created: 2021-03-12 01:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb996de264286bb4c78363245b812e04 SHA-1: 22694749f8a8568cb5240a9ccb609f60f2f4e629 SHA-256: c67b894a4ddbc0bad452192a267448178f94ee532335e72447eb0abb38d8373d
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it hosts a large number of external links, with the primary one being a potential lure. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF. The embedded URL points to a domain associated with malicious activity, likely serving as a redirect or part of a phishing campaign.

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://jumiwimov.ru/wix?keyword=what+are+alcohols+used+for
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/gadojezeduvenet.pdf
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/faranakulajav.pdf
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/786d5e8644fc3b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fotojipifuzitul/hyperphosphatemia_treatment_nice_guidelines.pdf
    • https://s3.amazonaws.com/bakoloj/best_digital_photography_magazine_for_beginners.pdf
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_81f7ed80d1cc4f4fa0ee40cbf4a3fc8c.pdf?index=true
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_90668f9391c8429cafb33443ce5ed033.pdf?index=true
    • https://s3.amazonaws.com/mafavuzenoliki/how_should_you_stretch_before_lifting_weights.pdf
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_beaa66570f2f4725811909b9e79fbcc6.pdf?index=true
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_e2eebc5ef3024306be607c44dd58378b.pdf?index=true
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_ecd22d13500f4799a5cbaacdf4a57c5a.pdf?index=true
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_e9b5160b31544057a46b3d0c6162d0eb.pdf?index=true
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_552fb6b068f9472b9c7a871b2b0225b0.pdf?index=true
    • https://s3.amazonaws.com/gadumagabusodel/47536557755.pdf
    • https://s3.amazonaws.com/juzinaramip/accounting_information_system_notes_ppt.pdf
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_dc3d5ca24ef649388b54bc4f52b56d37.pdf?index=true
    • https://s3.amazonaws.com/kefefetafij/renal_association_hyperkalaemia_guidelines.pdf
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_f8ab5d2922074a888e0094888702aba1.pdf?index=true
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_de27e82be7cd4603b67d8b2489818518.pdf?index=true
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_a560e047c4c04814a93b45af5ef65c3a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecea.bin
578f6c77914f438c626b28db0ca9ac40c2440ebc225467ae77e9c44142ff8d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 4848 bytes
font_01_sfnt_off0000fd82.bin
2984dfe687ffbfcb5cff4f2cd48a054c998351c65e7384c0c914f501c93b548f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 10196 bytes
font_02_sfnt_off00012060.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 4324 bytes

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