Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e677be8d896b43…

MALICIOUS

PDF

77.7 KB Created: 2021-03-10 18:52:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cfc4c196e5041db0f6b17ac79c478536 SHA-1: 8c2fcc2ecbaba2c207c4fa5614926caa95402fd0 SHA-256: 26e677be8d896b43328f6834102212625475338dd8a336fe7eb19659256d0c7c
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=bhagavad+gita+chapter+2+translation PDF link annotation
    • http://mikovil.mywebcommunity.org/the_night_circus_audiobook_free_online.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/medical_terminology_for_health_professions_5th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/sezibagigi/evhaha0/petedibavowekebetufegobev.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/dujixusavelipamuvojed.pdfIn PDF document text
    • https://cdn.sqhk.co/fejezolixo/jdjahfk/duwenux.pdfIn PDF document text
    • https://cdn.sqhk.co/nokowifupe/gfhigiS/rorukurelosapowizutemu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_ec3e3b0f4e5a476e8f600e98e4bf7616.pdf?index=trueIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_f70fa5fa998e4b03a74ec28b9ba7dda3.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_99a4f419f1c946efbddf6986c3ce319e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a2558d-800e-40fb-89d4-c3f4555ddf0e/pak_study_9th_class_book_2020.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_0b989eef6f8e455ba025e9fb1768d0b0.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_599a20a5414242cf9e15fe6324c438dd.pdf?index=trueIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_1efa426045bb41b6ad2064912e70fbea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8868e0-5e41-4f24-834b-ea912cfbedcc/what_are_the_complications_after_miscarriage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfcb8acf-fabc-4792-a1fa-eb3aca10f8af/rizeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8e87a8-4513-4209-8d0d-97e55767ab4a/78858340913.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_96f7b721c682414d90e026130b919fc3.pdf?index=trueIn PDF document text
    • http://nujugeteteda.myartsonline.com/jozipibefavikubi.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/sizetunemorak.pdfIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_6060f53938f347de920350fa1f501f1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7844933-48f5-404c-90a0-ffb2463787a0/is_a_raffle_illegal_in_california.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_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 5576 bytes
SHA-256: 5147fd541f43eeb5406a25cf5d1b18fcaf8b71523a885d1c0fd421fc859caeaf
font_01_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 10796 bytes
SHA-256: e2250d6c7b498a265d717820771564859f2389bd8a5316a9be756e06f2dd66e6