Malicious PDF — malware analysis report

Static analysis result for SHA-256 7516562c021b6e17…

MALICIOUS

PDF

124.3 KB Created: 2021-03-24 05:38:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6ee460506db3238886a0ab484461413 SHA-1: 7493bc4acfa839b7fa84cb4c5dc8ad6d2e91407e SHA-256: 7516562c021b6e176cc36f4441b5aade4b20e5342f31c132675bb7265efe2640
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with one specifically pointing to a keyword-based search result for a book download, suggesting a lure for advance-fee scams. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://zajinet.ru/wix?keyword=the+emperor+of+all+maladies+a+biography+of+cancer+pdf+free+download
    • http://rezonansmusic.com/88619014935kn0xy.pdf
    • http://iranomics.com/bikanesatamowewawitaozzyw.pdf
    • https://cdn-cms.f-static.net/uploads/4401555/normal_604ab2b052489.pdf
    • https://cdn-cms.f-static.net/uploads/4390663/normal_6012dcd670429.pdf
    • https://cdn-cms.f-static.net/uploads/4471688/normal_60394af10dfbe.pdf
    • https://cdn.sqhk.co/rikopekela/ihbTxie/missing_megan_movie.pdf
    • https://cdn.sqhk.co/zegofurop/RXmXgiV/sandwich_spot_palm_springs.pdf
    • https://cdn-cms.f-static.net/uploads/4460682/normal_60106a1daf6b5.pdf
    • https://cdn-cms.f-static.net/uploads/4456377/normal_602a3e24432ba.pdf
    • https://cdn.sqhk.co/fekerepusa/Mugh2gg/s_chand_physics_class_9_solutions_motion.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazuxujepov/worazivawotepukivowisira.pdf
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_c5a1c0c18544435da2e3056939e71c19.pdf?index=true
    • https://s3.amazonaws.com/zodawanuror/banjara_video_audio_song_ing.pdf
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_53f1a35ffe264c6cb3a50cd1f0a1fa5e.pdf?index=true
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_4cd2ff9ff03b4039b0fb1c53710ec3e6.pdf?index=true
    • https://s3.amazonaws.com/tejuvonixag/tertiary_prevention_of_cardiovascular_disease_guidelines.pdf
    • https://s3.amazonaws.com/gedimuta/68889230601.pdf
    • https://s3.amazonaws.com/womirofop/kuala_lumpur_international_airport_terminal_guide.pdf
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_b00e9e007f1744cf9b950a53e21590f7.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_off0001a87c.bin
a451ce12a06a688638f581af65d8594bc71ce705dd411692df0e9c11a85bbfcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A87C 5852 bytes
font_01_sfnt_off0001bc4a.bin
e395fb3abc847ab7c1142f5c362cbb447feaa3e766630276f83eb37388c3a08c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC4A 11656 bytes

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