Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b6314046ee653f…

MALICIOUS

PDF

70.6 KB Created: 2021-03-02 13:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2ca638abf1845e6aba350f0a10b55fef SHA-1: f293aaff193ada30359b985091b7c632e91c6c55 SHA-256: 58b6314046ee653fe8a8af818395e0cb8a2f7e4a870b02c50be52497e96ad139
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm heuristic further supports the attack pattern of luring users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/aws?utm_term=george+foreman+grill+recipes+rib+eye+steak PDF link annotation
    • http://kozidozilujivox.getenjoyment.net/jiruwiledaza.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/a_touch_of_class_movie_soundtrack.pdfIn PDF document text
    • http://giveaway2020.info/9107224922i7aae.pdfIn PDF document text
    • http://sallles.ru/where_to_buy_orbit_irrigation_partsd2urm.pdfIn PDF document text
    • http://indir-kazan.com/amazing_world_of_gumball_nicole_porn0pwny.pdfIn PDF document text
    • http://peteferix.mypressonline.com/hp_elitebook_2740p_specs.pdfIn PDF document text
    • http://penageli.getenjoyment.net/denon_avr-2312ci_arc.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/im_ok_youre_ok_summary.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/ven_ven_senor_no_tardes_letra_y_acordes.pdfIn PDF document text
    • http://kovatafob.mypressonline.com/35031569802.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/bupijila/bimulurunemetijede.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/iperms_cover_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/ecology_and_ecosystems_crossword_puzzle_answers.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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 5672 bytes
SHA-256: fdb9d4d1d569cd23b6731765ce6d264cc2c1ae93337e6f9d1130fd0bcfce15a1
font_01_sfnt_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 10880 bytes
SHA-256: 345d26a1d0d837b1f06c577935736759393e265cb13136f989a6544cf7245bbc

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