Malicious PDF — malware analysis report

Static analysis result for SHA-256 9216c0f89c9fe58d…

MALICIOUS

PDF

90.2 KB Created: 2021-05-31 17:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: da31f352062928728814eb2caa82936a SHA-1: 3fed7201304b5e43f84a91d2c55f6bafbe7f9234 SHA-256: 9216c0f89c9fe58df0eaa7c6a8fb4744294f1ceef12cc354bac89407f28522b8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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://infrive.ru/pbw?utm_term=what+is+the+difference+between+awg+and+mm2 PDF link annotation
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/460403.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/2096185.pdfIn PDF document text
    • https://xexewevifiwewol.weebly.com/uploads/1/3/6/0/136054804/3154837.pdfIn PDF document text
    • https://kivowitu.weebly.com/uploads/1/3/4/7/134703836/nudapomigademopikoro.pdfIn PDF document text
    • https://jofuzidud.weebly.com/uploads/1/3/4/8/134868871/3871167.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/9d91e0a2-e24d-4bba-bf07-ad17de0a7924/fafus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ed14f3-9add-441c-8730-e5b8eac347d8/nubiwigot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c35d1db9-596f-4435-bccf-aab9de14052a/the_human_centipede_1_full_movie_download_300mb.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144412449/kowevemojopulusirixafuva.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/when_is_s9_plus_getting_android_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03734aa-ec11-403f-9540-0bc873c78ea6/88804833131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abf14118-1b6b-49df-a290-6511649dc0a8/the_dark_knight_story_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b26f59-1bf1-4eb4-ba69-12f984d344e2/29669079373.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/how_to_find_the_median_of_grouped_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f625db3-041d-4b14-b07d-6e548044d91d/how_to_thread_singer_sewing_machine_4432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eab0bb6-2616-427c-a1b4-8e65379defb4/super_street_fighter_2_turbo_apk_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf287b8f-ae17-4980-abee-0dee36a3ed6a/gartner_magic_quadrant_2019_business_intelligence_tableau.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c088dd0c-84b8-45e8-9223-a6d7661fc162/podotupojavikobikavevonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5122ea97-0ece-40e0-9874-2a44318b3bdd/possessive_pronoun_worksheets_for_grade_2.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144415533/hypertensive_emergency_guidelines_jnc_8.pdfIn PDF document text
    • http://botinuba.pbworks.com/f/25788680574.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/22455783643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb5c2a5-4d66-406f-a3b5-3b55938d2012/head_first_python_code.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144413373/63455188248.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 5780 bytes
SHA-256: 51cbbe88a2d0a646b27a940d048c9cf20bd3c4f82a95cc3774057f396ae73ebf
font_01_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 12396 bytes
SHA-256: 12b09b25db06c45d1cb900a47b883538d3938961a1b72fccadcf83673bc6dbbd
font_02_sfnt_off000146e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E6 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940