Malicious PDF — malware analysis report

Static analysis result for SHA-256 278e5603c9359566…

MALICIOUS

PDF

79.8 KB Created: 2021-06-08 20:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a64c2816b5b5bea1bc8762c53ec661c6 SHA-1: 9a158196cf011ddf0a096f900f2bcf21cff6a7cb SHA-256: 278e5603c93595665919e255aeede646db681e601ec0c4486eb00c90c9727c50
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 0.9991

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://synerhu.ru/pbw?utm_term=tanks+game+unblocked PDF link annotation
    • https://ligefunodimab.weebly.com/uploads/1/3/1/3/131398292/fadudikexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_6027c3f288dac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5fea0bf818c72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_6060937e5c86d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476564/normal_601ef6a77e356.pdfIn PDF document text
    • https://tedowinoni.weebly.com/uploads/1/3/5/3/135304389/49cc6eb93b60d51.pdfIn PDF document text
    • https://romasipunup.weebly.com/uploads/1/3/2/6/132681769/4393312.pdfIn PDF document text
    • https://kodopexo.weebly.com/uploads/1/3/4/6/134693050/8950588.pdfIn PDF document text
    • https://tonapakosu.weebly.com/uploads/1/3/7/5/137511677/89240a6.pdfIn PDF document text
    • https://sidufuzijek.weebly.com/uploads/1/3/4/5/134598689/6901576.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481059/normal_5fc992a245bc6.pdfIn PDF document text
    • https://bajusokizuz.weebly.com/uploads/1/3/4/4/134400974/1ad02809.pdfIn PDF document text
    • https://libexezelidod.weebly.com/uploads/1/3/1/4/131454359/793296.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/e54668f6-ed7a-4d89-9dcb-955ca16d6e8e/how_to_remove_film_from_polaroid_instax_mini_9.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/kubokup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c718ed5d-9a3a-44fc-a1e0-05669ef3acbf/does_starbucks_nitro_cold_brew_have_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7507ad6-80e7-42a2-b388-d070d1ea9ff3/what_does_bible_say_about_drinking_milk.pdfIn PDF document text
    • http://patimedudemu.pbworks.com/f/73322595832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e501441-3512-460b-bf2d-d99e1007ddd6/lonidoxega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbf1882-ef93-44f1-8d18-8e4829794cd2/suvaxuxenurelejipexizuxos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2309b392-6427-4d95-adcf-a773ed2d2c83/best_device_to_read_digital_comics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/960eec41-a804-4b07-ab4e-aeec28ac3b22/28633250874.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/144527931/pisetosiluw.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_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 5316 bytes
SHA-256: 7db1ddec4a86cb9247ff98bbf8f457d32992f79ca2c48a4b925e7e1ebf42aae6
font_01_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 11532 bytes
SHA-256: 758df70eb52182f11258c99182cd8038612439c337a35a90444b009c0d3a2d16
font_02_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7