Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dddf74406be1fa…

MALICIOUS

PDF

77.9 KB Created: 2021-03-17 02:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: de653cb54b62866bdef06e1a3c78aa74 SHA-1: baf3961278a8c7083fc8a21ee53a0b090d7d709c SHA-256: 63dddf74406be1fa4002855f52bdd46c60c4ba0dc0910fbd38c576ac8b8718f5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one URL pointing to a potentially malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure suggests it's designed to lure users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/123?utm_term=baaghi+2+hd+movie++filmyhit PDF link annotation
    • https://cdn.sqhk.co/zubavagi/iaigMAz/24282248921.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/UXtLXi9/becoming_a_teacher.pdfIn PDF document text
    • https://cdn.sqhk.co/merodobiweve/jfhaCib/guess_the_word_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449775/normal_6002a90c9bc9c.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/Y41gc5Z/38759246798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5fcf0c97cbd46.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/5jhbBMr/vibaduxekeruju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_603ff75886a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_604ec464b4e58.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/oYZOczs/mathematics_textbook_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wememiguw/XghfmBg/ginikokogufofisanopazor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379048/normal_6006fd4429cd7.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/gedexim/27244533315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb599cc-aa2f-43b4-bf26-105b8791fcf6/how_to_install_smart_lnb_on_dish.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_850d4e2d4dd34eb2b3902b9b214269cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d25c68-f07a-496c-90e5-17d58410a73e/visivujezubixanalazuxuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538af37a-0b6b-4672-bfc2-733abba75b86/tiraxisijajonubesoxali.pdfIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_8d1b260c7a0844289bdc05a618817a3d.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_28bda502d9de4d3fa4fbf21ba5b8ab78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/74209610341.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/98514206810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/463d1efa-2e46-4f57-a2a9-cf790f73ae6f/wireless_gamepad_f710_driver_windows_7_64_bit.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_e03df81dc06f4e7d8e224aeee5d38138.pdf?index=trueIn 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_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 5392 bytes
SHA-256: c5e34ee268d77a79cc20a2df0b67be2a4edb202757c27e99448d809380984031
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 2092 bytes
SHA-256: 13678a14b930e6d42e11b2ac41b13981c2c7f5938cc30cfb194ad51886f1f1dd
font_02_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 10196 bytes
SHA-256: a4d95460f121101ccca233f6ccdf1837f0fcd38dee85cea83309ebfcc39f24bc