Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c998cdb6db55ef6…

MALICIOUS

PDF

72.8 KB Created: 2021-03-26 02:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42d0b80068ad5ed3b7dc851a17eae2c0 SHA-1: 29b0355704f7997a7c9e9503cc3b1d5241c2b14d SHA-256: 9c998cdb6db55ef63fded781d2468605d70e6d731dabf3ac79490786a8e9b97e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary malicious URL, 'https://druttle.ru/award?keyword=animals+flashcards+for+kindergarten+pdf', is presented in a way that suggests it's a search result, likely to trick users into clicking. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://druttle.ru/award?keyword=animals+flashcards+for+kindergarten+pdf
    • http://shoplus.info/vamiripazajekajegakazn423.pdf
    • https://cdn-cms.f-static.net/uploads/4415930/normal_601304dfd2124.pdf
    • https://static.s123-cdn-static.com/uploads/4407314/normal_5fedcf4696e73.pdf
    • https://kibalenujodoziz.weebly.com/uploads/1/3/0/7/130776895/1922451.pdf
    • https://kalogipewaga.weebly.com/uploads/1/3/4/5/134595512/lojuvazezujota_bawad_xibodadugex.pdf
    • https://womevelem.weebly.com/uploads/1/3/2/8/132814223/xefovuziku.pdf
    • http://nasty666.space/xfinity_remote_control_codes_for_vizio_tv3ngnt.pdf
    • http://doctorzlo.com/what_does_print_head_alignment_mean3d74l.pdf
    • https://safafiva.weebly.com/uploads/1/3/0/7/130739101/6484229.pdf
    • https://cdn-cms.f-static.net/uploads/4477162/normal_604e8e3146ce9.pdf
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/vomaboxiji.pdf
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/komakonebalizo.pdf
    • https://cdn-cms.f-static.net/uploads/4447276/normal_5fd666267e97d.pdf
    • http://islta.fun/59399849799dwnx5.pdf
    • https://liwuvena.weebly.com/uploads/1/3/1/3/131398027/7707482.pdf
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/zujipu_juwawo.pdf
    • http://1xbets-reg.site/inflatable_hot_tub_repairs_near_me8glxy.pdf
    • https://rigoxetevub.weebly.com/uploads/1/3/4/0/134017132/zavozig_popunarutev_rufanu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sevoga/michigan_auto_insurance_reform_effective_date.pdf
    • https://s3.amazonaws.com/donake/aligarh_muslim_university_online_application_form.pdf
    • https://s3.amazonaws.com/webipejonavuv/44972385115.pdf
    • https://s3.amazonaws.com/pokixovuxik/seizure_treatment_guidelines.pdf
    • https://s3.amazonaws.com/xezonijida/4102048715.pdf
    • https://s3.amazonaws.com/zeworibuzoza/anjali_bhardwaj_new_song.pdf
    • https://s3.amazonaws.com/dugibabafod/kipokezemekekapur.pdf
    • https://s3.amazonaws.com/rupatojuko/dizazilixoxatupetepavidoz.pdf
    • https://s3.amazonaws.com/wurivuve/pleomorphic_adenoma_of_palate.pdf
    • https://s3.amazonaws.com/mefonevimimix/bully_game_apk_revdl.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_off0000df25.bin
79dc25d649aeed7fecd5d620814d2d2c514c58f2f58ce377e45884b1c600b7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF25 5624 bytes
font_01_sfnt_off0000f216.bin
255c33da3a7305ff7929c3c2ca3fa3cf7a73988970a958d853f9873fb33172e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 10228 bytes

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