Malicious PDF — malware analysis report

Static analysis result for SHA-256 f937fae52be99776…

MALICIOUS

PDF

76.9 KB Created: 2021-03-18 19:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5517abf8292263b1d82634d5e9e966c SHA-1: 573399d99c01f7b05259d648f778bb1b2d5423a9 SHA-256: f937fae52be99776256eb987264aa5b9ef1d57f687662d7eb997a7fbebc2c5b5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The primary malicious activity observed is the presence of a large number of external links, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious sites or download further payloads.

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://botokaw.ru/wix?keyword=peirce+a+guide+for+the+perplexed+pdf
    • http://rupebakonodeja.iblogger.org/saddle_club_game.pdf
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/wefepoxanis-wepugoxo-jodawodisi-wunavolibumir.pdf
    • https://rupevegix.weebly.com/uploads/1/3/4/8/134887155/faginisom.pdf
    • http://nageramuvepom.mywebcommunity.org/tripura_rahasya_hindi.pdf
    • http://kigowamukidiba.iblogger.org/bernoulli_distribution_examples_and_solutions.pdf
    • http://dewobazul.22web.org/tunutopajosiv.pdf
    • https://vobilazi.weebly.com/uploads/1/3/5/3/135300702/tilitoboginapoda.pdf
    • https://riwinimogo.weebly.com/uploads/1/3/0/9/130969841/xarafa.pdf
    • https://nojokuvevufig.weebly.com/uploads/1/3/4/1/134109253/d04fef9754.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zevesijuduma.atwebpages.com/66040254795.pdf
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_a9969d42ce3d4a54b69dac4cf6ad844b.pdf?index=true
    • https://60b161a2-b511-46bc-b48c-7ca4331f2db3.filesusr.com/ugd/34b71b_5df0e0b2286b4f34855545c92edb52b2.pdf?index=true
    • http://daboloxasorun.rf.gd/57299706927.pdf
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_b41e65d8e8e84e418cf4e0d535f6e63a.pdf?index=true
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_3973c7d980d848239106e8b0c022b2a7.pdf?index=true
    • http://matixonapoler.epizy.com/barrera_hematoencefalica_componentes.pdf
    • http://tituxotal.epizy.com/food_judging_score_sheet_template.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_off0000edaf.bin
0ebd8b4c1fcfa33ccc3074693fa738b880e858ba078b69c83dc04dbe2cdc0b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 5308 bytes
font_01_sfnt_off0000ffc5.bin
cd729c9c567f3c7f455fbfc293ae541f00a90ee8b43e03f683675b6dc254a9a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 11308 bytes

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