Malicious PDF — malware analysis report

Static analysis result for SHA-256 992812ecff2dec31…

MALICIOUS

PDF

87.1 KB Created: 2021-05-10 08:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2453f0aacc9c2719d33cf9c7e9a3f422 SHA-1: 08a318cfdcdbbe327d9aab1f2c1ebca769885c9d SHA-256: 992812ecff2dec31722bf963d0e69d6fec4bf138c67db52792c2e14b25672e18
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=bulova+marine+star+chronograph+men%2527s+watch PDF link annotation
    • http://geesecam.com/buwegax2sa15.pdfIn PDF document text
    • https://penoruzeni.weebly.com/uploads/1/3/4/1/134132400/tokewulete.pdfIn PDF document text
    • http://tublitalia.fun/dd_miniatures_3d_printvg4pf.pdfIn PDF document text
    • http://rafale.store/eso_viking_buildc0a0s.pdfIn PDF document text
    • http://formblckr1.xyz/bosch_double_oven_manualb9yap.pdfIn PDF document text
    • https://wifusudufasebo.weebly.com/uploads/1/3/5/9/135992472/9995204.pdfIn PDF document text
    • http://tryraisins.club/how_to_port_mobile_no_idea_to_airtel1pasr.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/96559ce4-2060-4c33-8e3f-ec8af4bac7be/wesegemas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d29a910-b57a-4743-ac2e-c0f55d4c2504/24908254224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f91c977-9d3e-42a3-8dbd-a65abad54359/41788007849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e73562a-5a71-4c9b-970b-8aac49e53554/new_living_translation_audio_bible_dramatized.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07522d5-f107-4e9d-bdd7-1c0950f92a99/american_red_cross_blood_drive_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f16b26de-760f-4f4e-a5a7-0f233456de64/catia_v5_training_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a580b6-f85d-4201-b4fb-3ac58ff578e3/the_adventures_of_sherlock_holmes_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb23d3d-145c-4e00-821f-386441ed452b/what_did_we_learn_from_the_bobo_doll_experiment.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/information_about_sound_sensor.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/cappuccino_song_video_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/35475779668.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 3044 bytes
SHA-256: d876fbf9652518488d9ed6a22a6d6fd77f2b927843ae064fe02fc41f70a8efd9
font_01_sfnt_off000100ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 5584 bytes
SHA-256: 5d8526f884412dfb7be658c9660d794ebf3ea2c2aa059ee28a655edeb3e198eb
font_02_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 11100 bytes
SHA-256: b866ac61c4586e73e0d6e6f4c012e39340f5625efb8c937908a5bad8bf47dadc
font_03_sfnt_off000139bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BD 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb