Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ddf36f9e8c3f83…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 23:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e30fc2f057e6d1731e1624c4d102f0 SHA-1: 7e706a1a41cf432dd2a4ab429f2f0ea86fbe9465 SHA-256: f5ddf36f9e8c3f83bbc20d00e01734f61feb84f5d5178aafbbc50c5810e43140
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or SEO spamming operation. One of the primary external URIs, 'https://jacksth.ru/award?keyword=biblia+pdf+descargar+reina+valera', is presented as a search result for a Bible PDF, which is a common lure for phishing or malware distribution. No scripts were extracted, but the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=biblia+pdf+descargar+reina+valera
    • http://rofuxipof.mywebcommunity.org/bagaguk.pdf
    • http://didibemez.scienceontheweb.net/rechargeable_battery_types.pdf
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/5aa65da28948.pdf
    • http://gejedesoni.getenjoyment.net/19777353848.pdf
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/7270860.pdf
    • https://giburonolunege.weebly.com/uploads/1/3/1/4/131406036/2548421.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dogazisuze/xitonuke.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/can_you_follow_directions_quiz.pdf
    • https://s3.amazonaws.com/mokixetat/supreme_court_decisions_apush.pdf
    • https://s3.amazonaws.com/sefabe/sefugajomovesuzaso.pdf
    • https://s3.amazonaws.com/matogapibelifiv/icaap_stress_testing_guidelines.pdf
    • https://s3.amazonaws.com/penale/87612281090.pdf
    • https://s3.amazonaws.com/nigimul/63411757271.pdf
    • https://s3.amazonaws.com/jemisajoda/medudimigukemopo.pdf
    • https://s3.amazonaws.com/degagaziv/bosch_microwave_repair_manual.pdf
    • https://s3.amazonaws.com/tiduro/75525550483.pdf
    • https://s3.amazonaws.com/bededuxotulapil/interest_groups_icivics_answers_the_potato_problem.pdf
    • https://s3.amazonaws.com/sinadi/neropeminar.pdf
    • https://s3.amazonaws.com/xelimewat/what_is_multivariable_regression_analysis.pdf
    • https://s3.amazonaws.com/simujix/nonton_film_monster_hunter_2021_sub_indo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51a.bin
e1bb834e0ebfb97353233357bde228dc0bb1dc5f1be1f66258690c57c8ce3c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 5572 bytes
font_01_sfnt_off0000f81c.bin
cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 1936 bytes
font_02_sfnt_off0001015b.bin
cf9656ea9cc4907f34bb7e9c7f39426f3568bffc2930aef66aa584814c317899		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 11560 bytes

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