Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39a4de7bee5ba54…

MALICIOUS

PDF

74.1 KB Created: 2021-03-17 10:28:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fdbcef678c9de13bfbb1de27a3490933 SHA-1: 54bbb0e260887ac3a8bdea743d14913eb4e58e32 SHA-256: a39a4de7bee5ba54099f662f651315bcf796b923798b046d15242f9ac7e2d88e
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://resalured.ru/123?utm_term=carrom+game++java', is particularly suspicious and likely serves as a lure or a redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/123?utm_term=carrom+game++java PDF link annotation
    • http://extra-fon.ru/descargar_biblia_original_hebrea_traducida_espaolya6t2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475720/normal_602c2b942159e.pdfIn PDF document text
    • http://rezotu.xyz/colonialism_and_imperialism_in_heart_of_darknessauehv.pdfIn PDF document text
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/ab6808e2480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_6027a41768fb6.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/1477026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5fd7c2635df69.pdfIn PDF document text
    • http://eslife.pro/what_do_vegetarians_eat_for_christmas_dinner0g94n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5fdac65ea4715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_f134a53f647845e28a3a33a9fda95f9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mijumomub/49088442394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead9c712-8c13-4bc0-a002-dedbc4f71af5/what_does_religious_tolerance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34eeeeb2-0658-4af2-a8a2-a8baca3f8229/death_cure_movie_free.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_824cdd60906f40498c6082eb9ce0640c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/100a29f0-05b5-4429-98a0-afdaa6ee069f/41730437855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98463b76-6d50-4103-b91a-6c6b1dc3900f/64947111114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da59a82-f340-4085-9885-5985db9b0a22/do_xbox_360_turtle_beaches_work_on_xbox_one.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/yamaha_motif_6_for_sale_used.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 4508 bytes
SHA-256: 223ab70161d27d30983c49582710afd1a4c4fffc72f622bca874995c724893d1
font_01_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 11388 bytes
SHA-256: 675e1026653b7d896a9a3f41875b6f1839b30a4ac882acb42aa2473a061c1d4c
font_02_sfnt_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3