Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac642ccde2293e38…

MALICIOUS

PDF

69.5 KB Created: 2021-03-22 05:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 489a681a6e66be00ca57876af509690c SHA-1: a2845b95272b5c9dcf46bb67d59cc497ad39e70e SHA-256: ac642ccde2293e38e9a0161cebda62d8fbb1d57c6b3685b2fbb8e1f69108acd3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to unknown or potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://nipisod.ru/wix?keyword=omnipoint+miami+e+license+llc
    • https://static.s123-cdn-static.com/uploads/4378619/normal_5fe2ac6b2ae5c.pdf
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/7285075.pdf
    • https://gukusuwinadeg.weebly.com/uploads/1/3/4/8/134880507/5041c640.pdf
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/soxazu.pdf
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/juwas.pdf
    • https://cdn-cms.f-static.net/uploads/4419626/normal_604b21576a675.pdf
    • https://gupexududoteg.weebly.com/uploads/1/3/5/3/135302954/zimamafovi.pdf
    • http://fibisazorowax.mypressonline.com/ridoxuzatigawin.pdf
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5fd93b6c77550.pdf
    • https://ranazujip.weebly.com/uploads/1/3/5/3/135398887/dimilizet.pdf
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/72b8cd550d44d0.pdf
    • https://static.s123-cdn-static.com/uploads/4413456/normal_600391bfd05d8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d7917d58-55c2-428c-9612-f440a9b91e96/puntos_de_partida_10th_edition_workbook_answer_key.pdf
    • https://78636f1b-f2d6-4e4a-b4e1-07eac4c165d1.filesusr.com/ugd/434c97_b03dc40603754fb790fd2d074fc6f8d0.pdf?index=true
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_d7f1ebd4aa334f52ae9f96f9e76083cb.pdf?index=true
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_76797a5cc3994c378f1f3b1a1d941ebb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0f7ef5b9-89fb-4a50-abad-ca506dc3819b/roratavuf.pdf
    • https://uploads.strikinglycdn.com/files/76853434-4a9c-43fa-91bb-c927ca43892c/how_to_adjust_shutter_speed_on_nikon_d40.pdf
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_6347a7af3ca94b519618179f0ebd8424.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1dc21e37-e101-4882-ba53-a5b1a1dc9737/53037192898.pdf
    • https://uploads.strikinglycdn.com/files/89bd739e-5271-436a-989a-866eeec80758/sandisk_sansa_clip_2gb_mp3_player_driver_download.pdf
    • http://rukosivujuxu.atwebpages.com/fipuwikimavajikofumoz.pdf
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_9c6d285cb3944d29a534d03907f422f2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a1.bin
a1b866ff7379906db61a7252077030d1b8e52b6c571454557434b0486055b5b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 5012 bytes
font_01_sfnt_off0000e596.bin
b57a45df4c9ff865118b44e43f07f67db56a0d2f5e1e28ed6daa5a55a8cabb64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 10356 bytes

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