Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b928ebca4b430a…

MALICIOUS

PDF

84.2 KB Created: 2021-03-19 09:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08b09a53e08ef67fe6bac139ccb26b1f SHA-1: 7109a3919e9dd1b6e0cb0b5205c89e279a4d2d33 SHA-256: c0b928ebca4b430ae0df8a8501acb3cc44b6f08716f008aabd483d8fe48284d7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or distributing malicious content. The heuristic PDF_SEO_LINK_FARM indicates a large number of generated links, suggesting an attempt to manipulate search results or distribute malware. The embedded URL and the document body, though truncated, suggest a lure related to 'how to copy and paste multiple times', which is likely a pretext to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=how+to+copy+and+paste+multiple+times
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/fcf379acc1e9c.pdf
    • https://static.s123-cdn-static.com/uploads/4466135/normal_5fc79c6ed1368.pdf
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/bapulapabisenos-tepurolobisolu-manur-rafogaxef.pdf
    • http://nudukuju.22web.org/acapela_tts_voices_unlocked_apk.pdf
    • http://wokulorumal.iblogger.org/290529887.pdf
    • http://lefijuf.iblogger.org/funny_jokes_in_telugu.pdf
    • https://cdn-cms.f-static.net/uploads/4393641/normal_601a08d1bab1c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jerobej.rf.gd/xuvadokanavumusirokepeviz.pdf
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_bc018520fd6f434993363064123f04fc.pdf?index=true
    • http://zaniwemikadas.rf.gd/nitrogen_cycle_worksheet.pdf
    • http://desakoda.rf.gd/migasobagipidevowojujufu.pdf
    • http://zajonosexerubi.epizy.com/magic_tree_house_tonight_on_the_titanic_characters.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/33868096827.pdf
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_d96664485332422180ebebf98f390e11.pdf?index=true
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_3b4745f27a9c42f3be01ca4322dde168.pdf?index=true
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_40caa56cf13d4355b232d8fd86924387.pdf?index=true
    • https://s3.amazonaws.com/zunewidimem/26492471578.pdf
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_9880bedeb8d24d16aa1a048b5224c23c.pdf?index=true
    • http://nedomawof.rf.gd/63841488572.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010801.bin
ca26820da8429cdfdfa3f74817c43bc07e29701de2135ce2a8f5339d7d917043		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 5276 bytes
font_01_sfnt_off000119fa.bin
37d03dd12f41e34bd4eb447d9d6ac07eeb465c95bed966d89a84ca6458b3d7d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 11728 bytes

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