Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff84b862bc2a389…

MALICIOUS

PDF

77.7 KB Created: 2021-03-08 18:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da29a2ee64198cd14dae3f3af47097fa SHA-1: 285d2c80e6bd249cdea4d40ed2dfb2425bb54dec SHA-256: 8ff84b862bc2a3899cb7ebb18c72b52d54ffdc3126a4a904ad99f67d1222f149
196 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, characteristic of a link farm, and is flagged as an advance-fee scam lure. The document body, though heavily obfuscated, contains keywords related to 'introduction to behavioural science pdf' and 'wkhtmltopdf', suggesting a deceptive pretext to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://seumenha.ru/award?keyword=introduction+to+behavioural+science+pdf
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/5782022.pdf
    • https://musekakilex.weebly.com/uploads/1/3/1/4/131406804/jatobulu_ralonojavogage_donijumif.pdf
    • https://sobapeseg.weebly.com/uploads/1/3/1/0/131070394/bfb9b0.pdf
    • https://cdn-cms.f-static.net/uploads/4365620/normal_604422b5e3a89.pdf
    • https://cdn-cms.f-static.net/uploads/4490123/normal_5fea40236fe04.pdf
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/tabebozilar_lomowomuli_mogixiwobe_pagepepoxikap.pdf
    • https://cdn-cms.f-static.net/uploads/4421058/normal_5fdc367217437.pdf
    • http://wutoxurusot.iblogger.org/ridugominedujixegikipox.pdf
    • https://movamapipimopi.weebly.com/uploads/1/3/5/3/135303402/xamixilu.pdf
    • http://vomenelavive.22web.org/gilolelowozevesemuwiw.pdf
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/ababfd7c61.pdf
    • https://sudejewakigalo.weebly.com/uploads/1/3/4/0/134040490/93078f.pdf
    • http://bepumekelu.22web.org/top_performing_aeronautical_school_in_the_philippines.pdf
    • https://wabegikabakupoz.weebly.com/uploads/1/3/4/6/134668284/0fcb5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tejusadesivuti.epizy.com/capitalization_worksheet_grade_4.pdf
    • http://xefavab.rf.gd/wavemuvep.pdf
    • http://jujovotusenugo.epizy.com/36556238176.pdf
    • http://wajogiteseg.epizy.com/labepofeme.pdf
    • https://s3.amazonaws.com/ruzaganog/dungeons_and_dragons_online_board_game_free.pdf
    • http://bedozev.rf.gd/24909565632.pdf
    • http://rovututuxopi.epizy.com/fixinisidizifalijafazax.pdf
    • http://zalatux.epizy.com/25809558299.pdf
    • https://s3.amazonaws.com/watajive/pozobufezegogeriviboxesib.pdf
    • https://s3.amazonaws.com/sefepugolupalax/86701800427.pdf
    • https://s3.amazonaws.com/gezetega/67825566662.pdf
    • https://s3.amazonaws.com/wunojipu/simalevodudex.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_off0000f21b.bin
d14b51d775b3fa05ea540528f8cde51995316ef0b8f48cd51c9515a038147d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 5380 bytes
font_01_sfnt_off00010460.bin
c7ec634714010fe6e501dec107299da59688a5b17e3198b20f45765b3bc75764		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 10688 bytes

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