Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79d4d7c496ce98b…

MALICIOUS

PDF

85.8 KB Created: 2021-04-07 00:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf9a0d941b633db36d0fbe279d95dabf SHA-1: eb0c77461a57a5abde5ae0196682bcc895f07e62 SHA-256: b79d4d7c496ce98ba6ca7b78a8d905a7feaa3089465503a963592228731c4eaf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=brinkmann+5+burner+grill+manual
    • http://domsale.xyz/72002152560t7oat.pdf
    • http://2022god.com/silumvzt9z.pdf
    • https://cdn-cms.f-static.net/uploads/4476925/normal_606c4b5f96cca.pdf
    • http://community-day.ru/ask_the_dust_movie_reviewz0olz.pdf
    • https://cdn-cms.f-static.net/uploads/4497079/normal_603fc0980c331.pdf
    • http://fashion-deals.xyz/42395619322qx8w5.pdf
    • https://cdn-cms.f-static.net/uploads/4444866/normal_6037787ad1cc0.pdf
    • https://cdn-cms.f-static.net/uploads/4380694/normal_6035978c103c5.pdf
    • http://faceskinagainbeauty.xyz/15204309846qpb2o.pdf
    • http://sovetnik53.ru/the_natural_series_book_5lo9uz.pdf
    • https://cdn-cms.f-static.net/uploads/4447079/normal_603c8839d2c13.pdf
    • http://raftgjgr.space/whatsapp_plus_pro_20193brnf.pdf
    • http://espaceabonnes.com/allu_arjun_songstdrlj.pdf
    • https://cdn-cms.f-static.net/uploads/4427284/normal_602348513b224.pdf
    • https://cdn-cms.f-static.net/uploads/4415937/normal_6010fe87dffc3.pdf
    • https://cdn-cms.f-static.net/uploads/4485810/normal_603d03141266c.pdf
    • http://beautysale.site/cb_insights_fintech_250cxhq0.pdf
    • https://cdn-cms.f-static.net/uploads/4413361/normal_6010c51ec4ead.pdf
    • https://cdn-cms.f-static.net/uploads/4412151/normal_6046c8e55e64c.pdf
    • https://cdn-cms.f-static.net/uploads/4453338/normal_606c74cf6c300.pdf
    • http://buyfastedcircle.xyz/convertidor_de_gramos_a_litrosan6yo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_0a8f074c137d44b288c8b1c344384555.pdf?index=true
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_dba908472f3e446792d03a14ecea00dd.pdf?index=true
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_2022c88a75dc4a9e8f932a14f970fcdb.pdf?index=true
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_95b447e30e6249808ed3a0a6bb6b605c.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_off000110f7.bin
e601159f691780158f10aeb2c45108404352bc7596215a75f38def6b2f9f9ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 5204 bytes
font_01_sfnt_off00012299.bin
f2cff3d3b5a7520bf7680cdc8a567b26e297dedc66eac1335544baeebbd74fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 11464 bytes

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