Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c6352293f0c781…

MALICIOUS

PDF

72.8 KB Created: 2020-12-27 20:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ef584a26eda31cd4daa77bde9174d32 SHA-1: d8f33456852db3b6f90c50e7b45ac11030fa8f16 SHA-256: 56c6352293f0c78188edf7e5476e91401bb31cb538cd78af443c1df535d1bfe7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with a significant number pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'change layout template powerpoint', which, combined with the embedded URLs, indicates a lure for phishing or malware distribution. No scripts were extracted, but the presence of many external links suggests the PDF is designed to redirect users to malicious sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=change+layout+template+powerpoint
    • https://kobigaxa.weebly.com/uploads/1/3/3/9/133997295/9727494.pdf
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/kuxedezurowipe.pdf
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/f87eb35d.pdf
    • https://cdn-cms.f-static.net/uploads/4465935/normal_5fb90c5556d16.pdf
    • https://cdn-cms.f-static.net/uploads/4468294/normal_5fe798ca42e01.pdf
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/lapazusazuxasarik.pdf
    • https://nimubawelekuf.weebly.com/uploads/1/3/4/2/134265751/1800147.pdf
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/5a9ddff7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/c59911ad-adaf-4c99-af47-31ce61a6e89b/50444567647.pdf
    • https://uploads.strikinglycdn.com/files/64f2d927-5021-40a4-aad1-34402ddcf4e4/27572302571.pdf
    • https://uploads.strikinglycdn.com/files/08adb214-ed7a-4912-976b-2be93e482bce/aisc_design_guide.pdf
    • https://uploads.strikinglycdn.com/files/a115dd5a-2aef-43a7-a9dc-2a85c5fb4603/samsung_wall_mountable_blu_ray_player_bd_c7500.pdf
    • https://uploads.strikinglycdn.com/files/c75bfa11-4c16-4fc0-979b-90a9b169e55b/tewabakowuwevojux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c76f.bin
be7a5fb22cf22f9a28c61eae76262abf5e5c79a0a22126561724b36e3673feed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC76F 5156 bytes
font_01_sfnt_off0000d8e2.bin
28b14736ca18559eb0e01788b5040f6d280c8b7b4941c259ebf2ffaf0e6b5151		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 10348 bytes
font_02_sfnt_off0000fbf8.bin
32144e4b9ec9287b695873cdfc5e3bbbb7193246d663081cec1dcf5b1cf9e795		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 7808 bytes

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