Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9143f46116b66cd…

MALICIOUS

PDF

75.8 KB Created: 2021-04-01 01:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f08ef6aab45974d1eba400e4c60407f1 SHA-1: 26e06c9e5b5b15dd2f48c791fdfc0f6868e8e10d SHA-256: f9143f46116b66cd325967a2c46c1889c28a1933c311ba018922c103f6e29bd4
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, appears to contain metadata related to 'contractions worksheets for 4th grade', a common lure for educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/123?utm_term=contractions+worksheets+for+4th+grade
    • http://mamubisuk.mypressonline.com/30831898960.pdf
    • http://wijasagasipode.getenjoyment.net/woluluv.pdf
    • https://cdn-cms.f-static.net/uploads/4427809/normal_602d2bd35e90c.pdf
    • https://cdn-cms.f-static.net/uploads/4427499/normal_60329ae736b9b.pdf
    • http://nakezubelakibe.22web.org/kuxitufisaxu.pdf
    • https://cdn-cms.f-static.net/uploads/4502833/normal_605da02a99219.pdf
    • https://cdn-cms.f-static.net/uploads/4370284/normal_604a302818328.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_de10a35b347a4dc88c91f6a676381d04.pdf?index=true
    • http://dimarujevetuvif.epizy.com/77887467553.pdf
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_8731bbe7472540c096cb9b8b19b11798.pdf?index=true
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_1fcc96c32421484d9ca66830ac0e66a1.pdf?index=true
    • http://wozaxanakix.epizy.com/cheap_android_phone_deals_uk.pdf
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_8b62fd00f44b48c2b595fd6c7e7ba39c.pdf?index=true
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_b6898ea596524b87b450d0cfe0e89d88.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2f3c1473-72cc-49d6-8e58-c505fbc7380a/h.264_dvr_remote_viewer_software_download.pdf
    • https://uploads.strikinglycdn.com/files/9e986fdb-e37d-4e09-a1c7-5e75fd6c87e5/sixilakotal.pdf
    • https://uploads.strikinglycdn.com/files/c9efb5e3-691a-4114-b629-99ab4c43aede/kuxona.pdf
    • http://wajiletum.epizy.com/b_a_pass_full_movie_hd.pdf
    • http://gijomifede.rf.gd/bakuvanukipudazefir.pdf
    • http://wurezeradepup.rf.gd/68948738048.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf6.bin
4f7606f38888636a66a66a5beefa6efc3c54abda49767cea28373ab0d83c3990		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 5400 bytes
font_01_sfnt_off0000fd67.bin
648c689e7c06f3764e797f9ddbb0763c02b0e6912c791092145cb529e8efa6ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 10524 bytes

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