Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3ec87e265e0900…

MALICIOUS

PDF

70.9 KB Created: 2021-03-22 03:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 482f06ae91731b4db8a72836374f7546 SHA-1: 4c37afa11248ba2b1df114fedfd15cbb23203677 SHA-256: de3ec87e265e0900ec90d4a9802a635e58535fec15cf76bdbc63e9116a7f6120
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crophysi.ru/award?keyword=case+study+sample+format+pdf
    • https://cdn.sqhk.co/vuxitiwawi/ZBELFK3/are_great_pyrenees_good_farm_dogs.pdf
    • https://vasefifux.weebly.com/uploads/1/3/1/3/131382239/movid.pdf
    • http://accueilcmb.com/80935111003ckpla.pdf
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/regolulu-zijekepujapegi-dowidari.pdf
    • https://cdn.sqhk.co/sizebadit/ghiijcg/glitch_effect_photoshop_action_free.pdf
    • https://mubisajapesufu.weebly.com/uploads/1/3/4/6/134620746/lifabakumafidej-gufin-lutevitelejapu-safugi.pdf
    • https://cdn.sqhk.co/xupodafib/MgisThc/zolol.pdf
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/susurug_sofel_bamapiwafigi_govironolod.pdf
    • http://natgood.space/citizen_vince_book_reviewf4f9k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e1eb97d7-38e4-467e-a7aa-562cb632d9f1/kafunejurotixasadilizusew.pdf
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_020a340cc7f24139b17e7da9a36ca29f.pdf?index=true
    • https://s3.amazonaws.com/davubewu/coraline_movie_free_online.pdf
    • https://s3.amazonaws.com/pesetufavo/gizixa.pdf
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_003fe6f34dcc4761964fced05c90c954.pdf?index=true
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_c5a5fc97531844d1a4e8972dcef9221f.pdf?index=true
    • https://s3.amazonaws.com/bewibiwat/id_card_making_software_free.pdf
    • https://s3.amazonaws.com/nezanurugega/46131371949.pdf
    • https://uploads.strikinglycdn.com/files/a089639d-e33f-48e5-8321-c2957eb1a184/wamidibakul.pdf
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_61c795fcdf4044faaafdc90c12a7daaa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/49e82ba9-e1f6-46d5-929f-45f13aa1014e/how_do_you_find_slope_intercept_form_with_two_points.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41c.bin
eb7acba318cfbc37b3ca06353b29cb5d4f562dbf655c12edad6dccac432f692f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 5196 bytes
font_01_sfnt_off0000f5b8.bin
776cc428165d1af319cca87c7a14d917751efa410c5b2bce4d3bc8984812a840		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 10192 bytes

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