Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cfcbffff46520c…

MALICIOUS

PDF

88.3 KB Created: 2021-03-09 00:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5fb531be71b76acfff5190f64b568acd SHA-1: ee48e4800dfe5b29a4f71edc0f340a3084374817 SHA-256: 83cfcbffff46520c151d6d6751af848623fe102d34a2555e3592a0566ef0bcac
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content hosted on domains like 'golowaki.ru' and 'creditscorehelp.info'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/strik?utm_term=how+to+thank+a+teacher+email PDF link annotation
    • http://creditscorehelp.info/how_to_fix_the_suction_on_my_dysonhwzpc.pdfIn PDF document text
    • https://sifuparara.weebly.com/uploads/1/3/4/3/134352995/9215020.pdfIn PDF document text
    • http://onlinekartiadesi.com/89254801050b3jb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426408/normal_60035e08cb264.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/rugabugajenamum.pdfIn PDF document text
    • http://walkover.me/lirixoliguzqrjf6.pdfIn PDF document text
    • https://vimavopama.weebly.com/uploads/1/3/4/7/134769365/93e2adbd8.pdfIn PDF document text
    • https://rogapasutidubu.weebly.com/uploads/1/3/1/4/131438129/rirozuvuxul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5fcd5e6a33d9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451221/normal_5fcd8d403d4bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388420/normal_6004c1a044466.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/4d5bb65f-2397-40c6-992e-b59a7422733d/crystallizing_public_opinion_edward_bernays.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb5ef29-a5f4-428a-b7e3-f197c265648c/razor_a_weight_limit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf375d7-3fb9-48f1-bcc4-4c589b0849b8/is_fury_on_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79309bb2-c5ca-4c76-b6cc-4f4f2ff69f8c/73723137788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1985926e-3613-47a5-a0ac-1583bb4fb01d/potewupatemowiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfcca7d2-ca7a-48d5-98d5-a4e8cae65eb9/oklahoma_drivers_license_cost_for_seniors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b09fda8-9888-4be9-b121-704f15a27e62/logitech_mk330_unifying_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de0be0c-2932-41e9-a27b-154a9b699fdb/plantronics_bluetooth_headset_pairing_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e819d3a-d75c-4760-8f62-32a96fd0d622/24574757551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/866e68d8-4350-4e60-83e2-18298e5a0074/43191599786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/593f1cb8-2bb5-433d-9f46-e979ed87a3d7/30630300324.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_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 4980 bytes
SHA-256: 8f183be3458ee70b01b11115da4db9a3772f0de817fec6891640b5a9662f78fc
font_01_sfnt_off00011abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 10088 bytes
SHA-256: 3aa5ec7b908c7fd4a79d4189d8cc921dfb5fe3285303a30e9c1d0cdcf1b73dfa
font_02_sfnt_off00013d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D81 16344 bytes
SHA-256: 9c47a8ecf7103172530608de19fa11afb8a035ab51042e9cb8c6809f09ebb189

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