Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d54c3047987e9b9…

MALICIOUS

PDF

78.4 KB Created: 2021-04-07 01:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 313ec865bcf9593f08eb45db475b2cbe SHA-1: af5a0b9e41b951a5a4a00e1aa2eb6c315c97ca00 SHA-256: 0d54c3047987e9b95cd1c249471c30b8fc77596dbbedce47859abbb5be70297c
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be a redirector, further supporting the idea of a malicious redirection or phishing scheme. No scripts were extracted, but the PDF structure and numerous external links point towards an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/strik?utm_term=how+to+do+finger+joints+with+a+router PDF link annotation
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/cebeadab0.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/iijiDge/fantasy_flight_s_star_wars_legion_game.pdfIn PDF document text
    • https://vejelajaluseno.weebly.com/uploads/1/3/5/3/135392022/fc8f5bbcce2e0.pdfIn PDF document text
    • https://tezagezowuvese.weebly.com/uploads/1/3/0/7/130775310/8563271.pdfIn PDF document text
    • https://ronukava.weebly.com/uploads/1/3/4/8/134885886/7007689.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/ihbidjb/19189299611.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/iapnhaG/voice_recorder_green_apple_studio_apk.pdfIn PDF document text
    • https://vivimudovulab.weebly.com/uploads/1/3/1/4/131437737/wometadexavad_zafajekiwef_vokutuxam.pdfIn PDF document text
    • https://mawebugejememed.weebly.com/uploads/1/3/4/5/134599942/58d95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_5fe7e90fe6cff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_5fd7a8dd49f60.pdfIn PDF document text
    • https://jikuvubavul.weebly.com/uploads/1/3/5/9/135964228/jefolewomemixo.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/eVHidig/ninja_warrior_shadow_mod_apk_free_download.pdfIn PDF document text
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/1560810.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487903/normal_5fff6aca6716f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488100/normal_60067f872f3f2.pdfIn PDF document text
    • https://teduzagegoxow.weebly.com/uploads/1/3/4/4/134400331/lawaxapopupisi-ridepopiruti.pdfIn PDF document text
    • https://nazewaraja.weebly.com/uploads/1/3/5/9/135959380/radimoramimelo_razadufi_porowugijajuner_dukuturukoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408601/normal_603edd05cc08f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7667fe4-60f4-4972-a254-d5b62af2e0b0/4652490519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59edfc7-3ffc-46de-a85e-70b20e119bdb/72903595463.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_93835323a823468b9c9a40474e4ceb6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7e8df5-68a2-4ed0-b5bb-1d39a767cc2c/hp_elitedesk_800_g1_price_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86fb8044-6501-41e7-8740-86e2ae90d7d9/pofes.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_2a528a88cb704c689e6053e91eed1a00.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_5b37a675ba20448baf9d66acb61f049a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/802226c4-e78d-4e02-9ecd-1dc3580d5f81/89541708715.pdfIn PDF document text
    • https://7fd4abad-31f8-4c52-ae8e-93d0cc7f2af2.filesusr.com/ugd/910e70_5f6a02d3836644d8ae0d32c3faa76c97.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 5264 bytes
SHA-256: f285a23d5affa4cfb2c31527033f613e5013e14fe40a15b3ce444ffd5304fd34
font_01_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 11500 bytes
SHA-256: 9e76492210e76d8963eb7c87a27f6e7fb36a40efe1125d4a23b1f84cfc055f56

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