Malicious PDF — malware analysis report

Static analysis result for SHA-256 4540e03ca009a032…

MALICIOUS

PDF

81.3 KB Created: 2021-03-31 13:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 573a609e5bc98f0c92d9b8f811a63373 SHA-1: d88d7c760bdc5868f75958955d75836fe4f2a577 SHA-256: 4540e03ca009a03220dc6b9617f23c5a01a217c59f0211accbf147bba9ad17cf
194 Risk Score

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 contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to potentially harmful sites, possibly as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/strik?utm_term=beats+by+dre+studio+2+wireless+power+board+bluetooth PDF link annotation
    • https://woziwunamewig.weebly.com/uploads/1/3/1/6/131606321/kodewawogesonoxepaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446776/normal_5ff22d51bad06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fccaa3c5069f.pdfIn PDF document text
    • https://jatupixi.weebly.com/uploads/1/3/1/3/131398141/dufenemevatadefax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_601bddcd73f95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449009/normal_601f299f6fb21.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/Fjjjhg3/24578523693.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/HlfgeKD/pokeball_plus_pokemon_go_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462992/normal_5ff4a366e9708.pdfIn PDF document text
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/40608212f9ef2a.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/bjfijjc/costume_ideas_for_3_best_friends.pdfIn PDF document text
    • https://towoxaji.weebly.com/uploads/1/3/0/7/130740158/dagamadanif.pdfIn PDF document text
    • https://cdn.sqhk.co/gejikofoxaf/fig7ij3/rigalebugozub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4c148279-e3d0-4e0b-b251-978c93f73f59/how_do_i_get_sound_on_my_akai_mpk_mini.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_611f8861d69f48a2b21c58bde15e168d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/728c3c64-6f88-48a1-b5c2-d43fa09706a2/jeraxopepoxasenomugugapuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04c73dc-32e3-4fc2-9184-70b5c6d181ae/buvexoxi.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_ca3d15549df541a6bf8c986efae89f9c.pdf?index=trueIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_b633d98a4c054eb286091027e93e4def.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/193cbb17-41bb-4f48-a1d9-040d5a3752ba/what_is_a_container_in_aws_cloud.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 5336 bytes
SHA-256: 5aeeb519bc7560c11d6f584458c91c6a5bc5833f8d7111eb9df313f8fb4fa335
font_01_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 12588 bytes
SHA-256: c49a39ba8483f5ed559db064e7f4bc065246ebcdf7c2d98218cd168912453d13
font_02_sfnt_off00012756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12756 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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