Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8aa972eecbe63bf…

MALICIOUS

PDF

86.7 KB Created: 2021-01-20 23:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 852c87778ad104eaefdbe2c516e9ab57 SHA-1: b7526dddb10c14ebd761a7b0de6544badbe3e6b4 SHA-256: d8aa972eecbe63bffc67cabb3f42ad3635d90f575427adbd4b68869294021b6e
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating that at least one link points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of multiple links, including one to a redirector, suggests a phishing or redirection attempt to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=kargoz+mage+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4497359/normal_5febe64b79293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446275/normal_5fdafabbdeffc.pdfIn PDF document text
    • http://vuwavutos.iblogger.org/halal_food_guide_new_zealand.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486963/normal_5fde7d29d3529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412773/normal_5f9cd166a96b1.pdfIn PDF document text
    • http://sajitalunaded.22web.org/kofexosi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pagosunizuboroz.epizy.com/46814974828.pdfIn PDF document text
    • http://laverowe.epizy.com/91020050814.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/weather_report_doda_jammu_and_kashmir.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/instagram_feed_mockup_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/18803194445.pdfIn PDF document text
    • http://jifusewu.epizy.com/affidavit_form_victoria_australia.pdfIn PDF document text
    • http://todizegi.epizy.com/fawesonopenitadizuzu.pdfIn PDF document text
    • http://suvoxezol.rf.gd/wefogoguxokad.pdfIn PDF document text
    • http://dimarujevetuvif.epizy.com/block_story_creative_mode_free.pdfIn PDF document text
    • http://wojixefem.epizy.com/34350475718.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_off0001167e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 4956 bytes
SHA-256: 70c5d5080e51fda9804eca17615664d2d5c1437c2ac19a0f8396bac1c618225a
font_01_sfnt_off0001274c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274C 11688 bytes
SHA-256: 8b39b3a4e093d31ca9ac1db59759e35078a202b2982ae9365b2899bcf6feb367

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