Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f594a83bd806523…

MALICIOUS

PDF

76.3 KB Created: 2020-11-26 01:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2f27b9633775667836e36890965b1528 SHA-1: eac0d0bb4a9b75bbad1aee0034d2cca66e3a001d SHA-256: 5f594a83bd80652307c28073f39e221f00deec58da4d4426194ae85bffe7f406
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a lure to download further malicious content or engage in phishing. The document body, though heavily obfuscated, contains metadata related to 'The alienist caleb carr pdf download', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafffi.ru/strik?utm_term=the+alienist+caleb+carr+pdf+download PDF link annotation
    • https://gikigafe.weebly.com/uploads/1/3/4/4/134440869/0ed9d43.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/9069355.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/8191cbea7.pdfIn PDF document text
    • https://motetokazifizi.weebly.com/uploads/1/3/4/8/134885494/8961133.pdfIn PDF document text
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/337a5b62188.pdfIn PDF document text
    • https://gapidekejoz.weebly.com/uploads/1/3/4/8/134876705/bunujijoveriju_topokududeg_golurewosumu_tetidi.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/paserarowubi.pdfIn PDF document text
    • https://jubezotezuwu.weebly.com/uploads/1/3/4/4/134476040/pizememo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/stickman_fight_2_unblocked_games_66.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/pupefowixad.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/23629918528.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/28227683026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea3811c-f42a-438d-9776-976321af9aef/.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fbe5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFBE5 17612 bytes
SHA-256: d78fa1c4227f701414a9e5c2a44f4970fa5c74de6f1e9d4b634375d31c480a50
font_00_sfnt_off0000c4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E0 5212 bytes
SHA-256: 0d85d4206218c917ee07132fa55654956db12a45b0ed20d6b1476b5d5ca2baa9
font_01_sfnt_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 11124 bytes
SHA-256: 5113456eca7df36ef3aed2016c5a6f9c0ddfcf386ba09638333c0dc332e3ab52
font_03_sfnt_off000115b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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