Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39afd5b61bfe68c…

MALICIOUS

PDF

120.9 KB Created: 2021-05-04 03:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f087be19b441a4d88f8e15de35bbcb8 SHA-1: 79fe7e3c641baac3837e0d2ae5026b0f7929f1db SHA-256: e39afd5b61bfe68c1918720266132fc66c13cbc1ca507a71655339b64aca9bc5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm or phishing campaign. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The primary malicious activity appears to be the distribution of numerous external URLs, potentially leading to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/strik?utm_term=paint+shop+pro+save+as+jpeg+default
    • https://cdn.sqhk.co/latosagax/v0igIE6/xexofugomu.pdf
    • https://cdn.sqhk.co/panazomuv/imkMhhF/temotexexomumiza.pdf
    • https://cdn.sqhk.co/nivavepe/vqicKic/14026072658.pdf
    • https://cdn.sqhk.co/zimidenex/fiidRji/diep._io_2_all_tanks.pdf
    • https://cdn.sqhk.co/gimexigerub/PIa07gc/vonifusubos.pdf
    • https://cdn-cms.f-static.net/uploads/4408989/normal_601ee75c8e9bd.pdf
    • https://cdn.sqhk.co/wemopizajazo/Shbhjhf/download_game_maker_studio_for_windows_xp.pdf
    • https://cdn-cms.f-static.net/uploads/4471692/normal_6039505bd7208.pdf
    • https://cdn.sqhk.co/xogedusov/hiigyie/jazopimowapupal.pdf
    • https://cdn-cms.f-static.net/uploads/4496571/normal_6042cf7ea4000.pdf
    • https://sozuleku.weebly.com/uploads/1/3/5/9/135962343/c6825.pdf
    • https://retinagarar.weebly.com/uploads/1/3/4/3/134319249/gewadiwapedebupiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_4a5ee300065b4797bce8cbb0f96eca39.pdf?index=true
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_0fdfbda4392d44c0b827a5a2f568aef9.pdf?index=true
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_be4b7b50072742c0867250ff0eb48ffe.pdf?index=true
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_627602d85781441ab01565fe8e35d5e6.pdf?index=true
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_dc9115d1104c420cb747a750b3684d3f.pdf?index=true
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_449d696fed734274958907846b9e36a0.pdf?index=true
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_4c17d6fd152d45b194c984339d1a965c.pdf?index=true
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_58ed5b1c625f4c9caead0ba3417acdca.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d67.bin
cf9e412d58cdd746c8a39540dc36a46beca0b30ba5078c0821721570bfcf7c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D67 8208 bytes
font_01_sfnt_off00018907.bin
c823337bd72de6e5dc05b124b7792b880511c31067eb30e4018b9df7b3e7bb37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18907 5324 bytes
font_02_sfnt_off00019b1f.bin
53c494de215e833e9416ef3bbf9da98ff908dc02949fd8368a39e2aa158b39c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19B1F 13628 bytes
font_03_sfnt_off0001c6b4.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6B4 4324 bytes

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