Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d9bca18c2da104…

MALICIOUS

PDF

75.1 KB Created: 2021-05-25 12:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aad154b3adc05b04d4e271718fff0ba SHA-1: 129554a181be99e914b02e8c9c486af14d6e9fc6 SHA-256: 19d9bca18c2da1043a25fd1bc4df36a5c1a6cce154e1c8f617c61d15bc0b6f07
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, with one prominent URL pointing to 'seumenha.ru'. The PDF's structure and the presence of embedded links suggest an attempt to direct users to potentially malicious or deceptive content, possibly for phishing or SEO spam.

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://seumenha.ru/strik?utm_term=low+carb+vegetarian+mediterranean+diet+recipes
    • https://cdn-cms.f-static.net/uploads/4464739/normal_602f0ab2e48f3.pdf
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/wemebejerur-fopul-fogikujibusa.pdf
    • https://static.s123-cdn-static.com/uploads/4470836/normal_5fc6dc638f67f.pdf
    • https://xuravamu.weebly.com/uploads/1/3/2/7/132740838/4834682.pdf
    • https://cdn-cms.f-static.net/uploads/4447270/normal_603a1a459e982.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4200998c-090b-490d-a4ab-4795e534ae1c/80043851126.pdf
    • https://s3.amazonaws.com/gomakobez/omron_hem-650_reviews.pdf
    • https://uploads.strikinglycdn.com/files/59cf0dc4-f51a-420b-8101-dbe1353e2141/are_dickies_scrubs_true_to_size.pdf
    • https://uploads.strikinglycdn.com/files/c9b20d68-0dc1-4068-b4e0-130d80bf67fc/fumilenola.pdf
    • https://s3.amazonaws.com/nitidadufetenu/90396196971.pdf
    • https://uploads.strikinglycdn.com/files/755e4d6a-0439-4c24-9831-f30b72e70dcd/dr_heideggers_experiment_summary.pdf
    • https://s3.amazonaws.com/punurum/how_to_turn_on_sole_e35_elliptical.pdf
    • https://uploads.strikinglycdn.com/files/0cf74659-7778-42f2-9338-64f8ccc6bfef/vodegomusavagitomese.pdf
    • https://uploads.strikinglycdn.com/files/aeefe021-2bdd-43de-a1fd-15226331a252/15404296518.pdf
    • https://s3.amazonaws.com/poguvelefa/how_to_fix_a_rusted_frame_on_a_jeep_wrangler.pdf
    • https://uploads.strikinglycdn.com/files/cd9d2dee-a6fd-4ed5-b0b2-a0a7e7344c5c/learn_how_to_use_epic_software.pdf
    • https://s3.amazonaws.com/mexesazaxasa/20851391336.pdf
    • https://uploads.strikinglycdn.com/files/7dfdf22f-0569-432f-b471-b34c205c10f3/materias_de_historia_que_caem_no_enem.pdf
    • https://uploads.strikinglycdn.com/files/514c8b6e-847e-446b-af77-6f59b3a67062/singer_heavy_duty_sewing_machine_4411_best_price.pdf
    • https://uploads.strikinglycdn.com/files/5102231e-691c-4647-ba45-06d8a804d4a4/mimivenatazafowiw.pdf
    • https://uploads.strikinglycdn.com/files/9ad1ca50-6df1-4ea3-b228-be50476a50b3/58558254116.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_off0000e7f8.bin
c4809f218b7167142e643885574654baea1fc998d80551aa8ba487a72875f5d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 5592 bytes
font_01_sfnt_off0000fafc.bin
8c2f2f9357bbbe9f1c4e204ab819d92e45df860e529e1806fde33ce7a11c621f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 10552 bytes