Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4414fe705a7643…

MALICIOUS

PDF

81.7 KB Created: 2021-04-29 08:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9d4958d0935d17497c05c80327f0cf11 SHA-1: 9b819215633fbbab5c12fad5608b872ea23bfab3 SHA-256: 5e4414fe705a76434b5b841427515d29504814d176589072fd0790aefb72f22d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

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://jottigo.ru/strik?utm_term=what+does+dog+poop+in+your+dream+mean PDF link annotation
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/rajuf.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/tivijata_rimigiger_xoxulakidugo.pdfIn PDF document text
    • http://erogan24.website/bekedavotikuvekokepag2mkfr.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/62392893336ws77q.pdfIn PDF document text
    • http://cucoupon.info/694295424164w82a.pdfIn PDF document text
    • http://arevakar-travel.com/windows_10_usb_operating_system_not_foundbz7p4.pdfIn PDF document text
    • http://mpvideo.org/zombie_virus_zombie_fps_shooting_zombie_gamesrsqej.pdfIn PDF document text
    • http://greatholl.com/str_dh520_arc8kvr4.pdfIn PDF document text
    • http://kefets.xyz/intermediate_algebra_for_college_students_8th_edition_by_robert_blitzereecqo.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/6e8e6859-f702-412e-9fad-4380430cab9c/18897390855.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_6b5f4b2eb802481e8f6dbfe9ec5cd8ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca1462c-c2fe-47d8-94d0-3b7ec02cf496/most_valuable_batman_comics_from_the_90s.pdfIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_b967b349b4b74dc1a4bc253bf7bfb204.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9655f8e-b463-48a9-99e1-d727fbea3fde/76507006631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3769b1d-12c6-4b0f-b0ff-67ed37abcb13/73556533492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3262cedf-a382-40a8-a5f9-3a0236fbeece/what_is_the_code_for_sharp_tv.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_b0e97c77f4d04b3296365407d9b5aef1.pdf?index=trueIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_f707b48cdb764b2f8be6c70933cf195a.pdf?index=trueIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_d78c858dc3d1466781fe51b69c63a65a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a5b09c-af00-4a22-82ce-0e3eea9700b5/how_to_replace_water_inlet_valve_on_maytag_washer.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_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 5456 bytes
SHA-256: fe330f730631afd183678d5bd6f513b29ba453f4f45efdda9db07326b8217e07
font_01_sfnt_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 10640 bytes
SHA-256: c257ed6fe62dc99ef6fd06d09b4d26964430cae163994b5d7d85e698bb1aa709