Malicious PDF — malware analysis report

Static analysis result for SHA-256 49872291bdbbf925…

MALICIOUS

PDF

77.8 KB Created: 2021-04-10 19:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6440a2b4798c1222ab690bcf1ca21f10 SHA-1: 4b44e20410f54ce0a8763d6000fa8a86b54dbae4 SHA-256: 49872291bdbbf9256a0a134bea0548a62e362e71ca6be33f8273028e586108ab
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document body contains a deceptive title suggesting movie streaming, which is likely a lure to direct users to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and numerous embedded URLs. No scripts were extracted from this sample, but the overall structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 http://www.guninetwork.org/system/files/webform/heirri_proposals/nuxikovevevugodir.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/dakorudi.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/pidefukil.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/52872338461.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/75468476758.pdf
    • https://www.jwico.com/sites/default/files/webform/69174909787.pdf
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/banofamuwidobekoke.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/28693943460.pdf
    • https://www.uts.cw/sites/default/files/webform/xewaz.pdf
    • http://portal-mysigma.com/system/files/student-proof/pifudolaloxafedotodela.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mujhse+dosti+karoge+full+movie+strea
    • https://minorsoncampus.princeton.edu/system/files/webform/fujixedapilevunagujos.pdf
    • https://www.healthdata.org/sites/default/files/resumes/jojilekavoxojomoz.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/65910459182.pdf
    • https://printandmail.princeton.edu/system/files/webform/83401752781.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001120c.bin
7bbe5751b209188c2ffa54ff20c873e32502a5349640773a5c7f6e527219bf07		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1120C 16376 bytes
font_00_sfnt_off0000d0b2.bin
ee9d70395d26013493397929bf5c6cc5587a263e63b0918242eece2c8eeef643		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 3060 bytes
font_01_sfnt_off0000db95.bin
c4a187e197d4a9791be321ad1976e1761dcd5c4f37b4f33691465d96445d6f50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 5528 bytes
font_02_sfnt_off0000ee4f.bin
562815f5100e3122489ec132c38294b9ac020075b8c277f6faab384ead2192b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 10392 bytes

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