Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f31921ee6415e0a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 15:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a95bcd8c2c3fc78041985d6f270ea1d2 SHA-1: 1e1f7b249c907862a714b2dcfce80df0bef5f620 SHA-256: 7f31921ee6415e0a3929a4fe5d0a4580f996de5fb0078c45dd99a7738f4da822
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are structured to appear as search results for popular content, indicating a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

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-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://resalured.ru/wix?keyword=dragon+ball+devolution+unblocked+everything
    • https://cdn.sqhk.co/gabisolovima/fidiexk/smart_sync_cloud_storage.pdf
    • https://panelaxefejavej.weebly.com/uploads/1/3/5/3/135306159/pekaju_sopozafezogut_dosexugotimas.pdf
    • https://cdn.sqhk.co/lorakerasima/ijcgihb/off_road_prepared_land_rover_discovery_for_sale.pdf
    • http://digovin.getenjoyment.net/falonulafuzoxip.pdf
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/325129.pdf
    • https://dukidisivaturan.weebly.com/uploads/1/3/5/3/135311912/papov.pdf
    • https://xozilawowoxov.weebly.com/uploads/1/3/4/7/134704750/851ecc8.pdf
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/1121304.pdf
    • https://xoxawipexari.weebly.com/uploads/1/3/0/7/130775732/d25fc17bfb1ff8.pdf
    • https://luzenage.weebly.com/uploads/1/3/4/3/134317967/5049441.pdf
    • https://cdn.sqhk.co/xinefegepe/iKv48jc/viticulture_classes_online.pdf
    • https://denutuzuno.weebly.com/uploads/1/3/4/7/134706868/1047666.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dopugaxelelema/74066309688.pdf
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_8cf5d89b2685447cbff2a8a5e6994a76.pdf?index=true
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_8be3195f6a344d878b109ffa59b78dd6.pdf?index=true
    • http://pevipitoz.atwebpages.com/tawegovidoditodo.pdf
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_9bfaa87cf5ee40e3bc83b525c0392dfd.pdf?index=true
    • https://s3.amazonaws.com/bufexa/26779580391.pdf
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_bfb865e0576e40528ebc3139c77c8ed7.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_off0000eb34.bin
9a586ce1b6f61f20d4642e363d82fa3cc2e275502ed978e6c1734d9054385d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 5388 bytes
font_01_sfnt_off0000fd93.bin
634f373995934a856643cffc390207f15c99fc64795c79e71dab064cd49af355		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 11852 bytes

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