Malicious PDF — malware analysis report

Static analysis result for SHA-256 936cdc191e4f15ad…

MALICIOUS

PDF

78.5 KB Created: 2021-03-09 11:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ed7279bad164e8aa6136c1060e450efd SHA-1: 671233ff94f026cca70eddb1eb8947d29ad25b87 SHA-256: 936cdc191e4f15ad0a74ec329c62bf41094edbf0b4f50b03c69cfe2164e99c35
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious sites. Heuristics indicate it's a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, likely phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's intended to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=what+is+linear+model+of+curriculum PDF link annotation
    • http://nekuwagibajese.getenjoyment.net/21618649121.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/fxji3hc/table_tennis_world_tour.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_601ba805e78a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487902/normal_5fe4fdad8142a.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/84293197850.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/ihGhfhd/46237119149.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/jf4CDXs/realdash_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/jgj77hj/rifixakotukibiwawifefu.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/jcgc6gp/puzubalafu.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/mUijCFK/duck_hunting_kayak.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/cv_format_for_students.pdfIn PDF document text
    • http://fazurusitu.getenjoyment.net/2530546550.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/0hhyWjb/21246633607.pdfIn PDF document text
    • http://fogafiv.mypressonline.com/what_is_the_ending_of_my_cousin_rachel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3a00e7-fec7-42b1-a9d6-58a154dd2db3/heraclitus_fragments_greek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b8582d-6d3b-49a9-948c-c0b770e7cbb4/vixagejalokonilepog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136e0445-dd53-4bf7-9a38-643ebcd37f84/the_end_of_the_affair_book_2_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d41f28-7618-4bc4-9376-7462b0430a51/war_of_the_worlds_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff176382-3261-42f4-b854-c9261aa9e6db/numojis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926e51c6-16a1-4947-ade2-6da973fe4532/what_is_the_opposite_word_for_lonely.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ce288e-63a8-45d7-b684-1a8e35f5cb1e/grammar_spelling_and_vocabulary_-_activity_book_-_grade_4_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_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 5272 bytes
SHA-256: eb45d4ecb65653eb5c6a9cf7b52a2e3dd1f6afad8386ac9a7a15637e3076036f
font_01_sfnt_off000108d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D5 10324 bytes
SHA-256: ea442686242712567762e5e3c43dfaf6b4d4e06f40cc5bf1e67aac74bc00c5ec

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