Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f30814c71c94a0…

MALICIOUS

PDF

69.5 KB Created: 2021-03-16 07:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84a6ae0904cd31ad7dc83b19d2e54ce0 SHA-1: 45c08002d1208d6ee47d0c1ca43cc490508e2224 SHA-256: d1f30814c71c94a03b733064c7951f131faae99bfb1ecb445990fc819b1258c2
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, with one prominent example being 'https://static.s123-cdn-static.com/uploads/4426062/normal_5ff54a491679f.pdf'. The 'SE_INVOICE_LURE' heuristic further suggests a deceptive content strategy, likely aiming to trick users into clicking malicious links such as the one found at 'https://kuzutuzo.ru/aws?utm_term=is+wv+dmv+by+appointment+only'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kuzutuzo.ru/aws?utm_term=is+wv+dmv+by+appointment+only
    • https://static.s123-cdn-static.com/uploads/4426062/normal_5ff54a491679f.pdf
    • https://static.s123-cdn-static.com/uploads/4421960/normal_5fcc6c331663a.pdf
    • https://cdn-cms.f-static.net/uploads/4451374/normal_5fd8f91838407.pdf
    • https://cdn-cms.f-static.net/uploads/4451744/normal_5fd71315d27b2.pdf
    • https://cdn-cms.f-static.net/uploads/4473919/normal_603f000511d9b.pdf
    • https://sivipafegedijog.weebly.com/uploads/1/3/4/4/134443607/932145.pdf
    • https://resewirebibabap.weebly.com/uploads/1/3/1/3/131379054/fosomopubofojim.pdf
    • https://static.s123-cdn-static.com/uploads/4482399/normal_5fff35f5c8b12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_14dc2104e146418ca21e62e8edf11d1a.pdf?index=true
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_5274ad22b36b4230abe87df658767775.pdf?index=true
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_e6d6806a6c854806aab6e5ee6a0c5d54.pdf?index=true
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_423242ee86a54311b7c75ec27875ddd0.pdf?index=true
    • http://xebojipex.epizy.com/carl_jung_aion.pdf
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_cb7d013490684e9ba3e18172293a6422.pdf?index=true
    • http://remigesej.epizy.com/jawevibilufawojimudepega.pdf
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_42dec35fd4214f49a8bf262010d1d150.pdf?index=true
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_073be015360c4213b1d8ac8eb8ea56e2.pdf?index=true
    • http://xepepofebaxuvib.epizy.com/library_journal_book_review_submission_guidelines.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2fc.bin
b83d2232e1a78e782486ee3bccc1c765e40f33c4f3c07b73e4af5ee836e765df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 5340 bytes
font_01_sfnt_off0000e529.bin
1e7341fe43d96bc534d0b14f49beab7025879c024f5f33806529960eb7675e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 10420 bytes

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