Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a874b3d9eee773…

MALICIOUS

PDF

65.7 KB Created: 2020-12-22 22:16:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0aa460b1c26158ca6f91c16d26506d0 SHA-1: 768c375814400363480ca1e1d7ceadb2ff6fae63 SHA-256: c8a874b3d9eee77362eadcf6c8829be711824eb0fdd1c4d410cc0a049776fb91
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links, 'https://trafffe.ru/strik?utm_term=amtrak+route+map+west+coast', is directly embedded and likely serves as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/strik?utm_term=amtrak+route+map+west+coast
    • https://bevugatumuga.weebly.com/uploads/1/3/4/3/134316863/9f80b7b35.pdf
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/1824750.pdf
    • https://dodafuwunolig.weebly.com/uploads/1/3/4/0/134016835/6023181.pdf
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/xekuwip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a93cad58-55ce-4599-8f9f-81f943733b9f/42371273540.pdf
    • https://static1.squarespace.com/static/5fc0fe386b97992eb55c938e/t/5fc86afd6031f473861f63aa/1606970110351/skyforce_unite_cheats.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/kazalibavaje.pdf
    • https://static1.squarespace.com/static/5fc0b3f1d49dd12447331c2b/t/5fc146379b1ed035380ac070/1606501943816/chick-fil-a_first_100_reddit.pdf
    • https://static1.squarespace.com/static/5fc720759ea50d41209feaf7/t/5fcc8eb57ae85b53b28c1f39/1607241398455/pixel_game_maker_free_online.pdf
    • https://static1.squarespace.com/static/5fc0d4a28139af037644e7e6/t/5fd1746bd97b572b89cfa55a/1607562349400/nizewilogajugikun.pdf
    • https://static1.squarespace.com/static/5fdc9f1e8b13fe0be8181d02/t/5fdca5b4d1d11b6b5bc37d59/1608295860879/8829144913.pdf
    • https://static1.squarespace.com/static/5fc7b1f1791da6493f6c03a4/t/5fcd423833187724c4fe699b/1607287352659/51323282880.pdf
    • https://s3.amazonaws.com/nedijowewoded/52758370748.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4958e18c5c478ef1eb6d/1606371672943/que_es_una_tesis.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_off0000c585.bin
9d5ffd89bb5e44bc6e354f9b65738812c4ebea914d9f1d814973f0043567679f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 5192 bytes
font_01_sfnt_off0000d72a.bin
8fc7afc779ec310032d01d5c124602c353e4f97e2616bb87013f39c3d58a0c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 10356 bytes

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