Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b352136636d1c3b…

MALICIOUS

PDF

78.6 KB Created: 2021-04-06 23:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4912951e965ae1c3af7fb4ef1d302dea SHA-1: 5a413e5e77e050a46f68eacb837d8b048131deee SHA-256: 7b352136636d1c3b308dab2ce7dc4099f4b7de7ad52edde88605ee4efe90b764
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL being `https://seumenha.ru/strik?utm_term=wolf+oven+repair+calgary`. The presence of a link farm suggests an attempt to direct users to potentially harmful content or phishing sites, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=wolf+oven+repair+calgary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390382/normal_605c10b3404ff.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/ujdWvhh/31456273402.pdfIn PDF document text
    • https://cdn.sqhk.co/gatezoru/jaifQhi/us_states_and_capitals_free_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/fezusife/hehahjC/lightroom_classic_cc_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/jjigrib/9806228830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_602f467619824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5fe81f807349c.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/oxford_dictionary_english_to_telugu_download.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/56442086393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5fece7dabc0bd.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/92077918109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_605bf20e96f81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_b51fc2bbad5a4d3083b27b03f8d80de2.pdf?index=trueIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_d091ba9bf3084170af2fc7f11e0b7d05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosagoba/panabajerijawumunu.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/excel_2013_delete_sheet_greyed_out.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/zenowifirafegut.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/friday_the_13th_game_trophy_guide.pdfIn PDF document text
    • http://telusomabufa.onlinewebshop.net/97966437972.pdfIn 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_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 5180 bytes
SHA-256: d2700864e0c14b29a95a6e90a08967276b9ecebdb5d08ceff3ca9f016ac623d3
font_01_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 12780 bytes
SHA-256: 914a214356a6a9a8a0a10b2fa706d0c026991a1a9981054db957c940c579d0ca

Open this report in the interactive analyzer, or submit your own file for analysis.