Malicious PDF — malware analysis report

Static analysis result for SHA-256 d337bd672132e9c6…

MALICIOUS

PDF

82.9 KB Created: 2021-05-14 15:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e6995f699a21d9762d6401400c452a55 SHA-1: 9944dab006ec13fbcbd31a85671ae0d63ccd0187 SHA-256: d337bd672132e9c66a228b52ae0663dee3c76e769c4d4e83937067d4f33dff29
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for link farms, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=frigidaire+professional+refrigerator+service+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448538/normal_60610680514ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458122/normal_605260ffb0b70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467007/normal_603c2cae211e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_6056f15547b3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_606e6f3d94f49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_600f560092a1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408009/normal_5ff6c14fa1ec1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/best_telescope_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55aa4d86-e2e0-44a8-bba9-c75b58d9d641/what_was_the_first_political_party_in_uganda.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/81755713036.pdfIn PDF document text
    • http://migepirusikoj.rf.gd/periodic_table_pic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6e8f63-e232-460d-99a6-a0c4b7d17a2e/intel_n1996_motherboard_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/sugelaxalulajaxid.pdfIn PDF document text
    • http://vanumezaxibet.rf.gd/s_e_a_t_o_full_form.pdfIn PDF document text
    • http://dakawarinuku.epizy.com/xisubokomiwirid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c93199-617b-4300-bcaf-8ce8a0ab8343/cyrano_de_bergerac_play_plot.pdfIn PDF document text
    • http://zazufazujinuzo.rf.gd/library_accession_register_format.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/solucionario_mecnica_vectorial_para_ingenieros_dinamica_9_edicion_capitulo_11.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 5488 bytes
SHA-256: fd9c9730f79add4fb78e8d0fcd7226442539f7da156736d9d67ef36dcb6703f7
font_01_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 11332 bytes
SHA-256: 0b06c7e3362f88059fd23c2434e48227e312126c314ab606894b9a95968a6e73

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