Malicious PDF — malware analysis report

Static analysis result for SHA-256 0081220e009f3abd…

MALICIOUS

PDF

122.5 KB Created: 2020-12-27 22:20:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30cd74e6b459013acc337034280837b1 SHA-1: b870f829b36d52c54bc70f24c61b246093888c6e SHA-256: 0081220e009f3abd902a9b49bea4ac715054422a38f42f5257147e0d7d738be6
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 hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://traffnew.ru/123?utm_term=is+funimation+shutting+down
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/90453e152.pdf
    • https://cdn.sqhk.co/tiwumixe/RmgcThd/slitted_masks_for_band.pdf
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/2b426.pdf
    • https://lupakekurusope.weebly.com/uploads/1/3/4/6/134652685/8954899.pdf
    • https://nefitajufu.weebly.com/uploads/1/3/4/7/134712437/rununo_zuvadozoj_vogajafaw_tilatum.pdf
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/gufixurakato.pdf
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/gibujudaxagubag.pdf
    • https://cdn.sqhk.co/devurekon/iQtq4jj/napipuj.pdf
    • https:///ht.wikipedia.org/w/index.php
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9f82eb9d-1172-4c9b-bb6d-6eddede94b91/mogasaxujob.pdf
    • https://uploads.strikinglycdn.com/files/cc533676-2037-41b7-b136-2c592de4d4c1/5th_edition_players_handbook_fr.pdf
    • https://uploads.strikinglycdn.com/files/20d11e1b-a716-4602-a178-9cbc19b8d269/copper_chloride_complex_ion.pdf
    • https://s3.amazonaws.com/kofabube/bioinformatics_algorithms_an_active_learning_approach.pdf
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016952.bin
d22cac10f319a008d3a3a07023c4d76637f032ea38873d2387d8d1eced661efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16952 6444 bytes
font_01_sfnt_off00017944.bin
c909587374b7944baf25a49d7dc1238a3c7875135f4b8e99c3058a1662e55c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17944 5224 bytes
font_02_sfnt_off00018af7.bin
8c5da3f23bd33354e7ae6b914ed4805b187dcb3822e5d299111943b605b22865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18AF7 13404 bytes
font_03_sfnt_off0001b754.bin
0f21984fa7cb9339070bdff080910d5e7263f496cf46f9dcc897624b3d41ffed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B754 16088 bytes
font_04_sfnt_off0001cc14.bin
eb80847d8dba01a5820725e90e7ce34ea194e4a3655cd904e31c5f2c966969a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC14 6200 bytes

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