Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c5cdd76718c1d5…

MALICIOUS

PDF

58.5 KB Created: 2020-11-21 21:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1da8967e1307e5e0bd261834b0ed741 SHA-1: 73d4ab05377ca47377c08d9639375d722e96d744 SHA-256: d3c5cdd76718c1d5894e4107413ce1bc9ab32b9a2bff2daa4146d298f4ac0d77
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating a large number of external links. One of these links, 'https://traffset.ru/123?utm_term=black+corset+top+strapless', is directly embedded. While no scripts were explicitly extracted, the nature of the PDF and the presence of embedded URLs suggest it is designed to redirect users to potentially malicious or deceptive content, aligning with a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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://traffset.ru/123?utm_term=black+corset+top+strapless
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f89a6b180980.pdf
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/fonunu_gopofok.pdf
    • https://wabozejitikaz.weebly.com/uploads/1/3/4/4/134495441/lirizajiku.pdf
    • https://vejurinunabesud.weebly.com/uploads/1/3/4/7/134705678/melufiwemelaw_tazinuvaxodo_kunedugewofefo_muxijomufoze.pdf
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/3683425.pdf
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5f8a4bb0b03e6.pdf
    • https://pimakiwukusa.weebly.com/uploads/1/3/4/7/134712386/8691765.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ginutu/the_book_thief_download_free.pdf
    • https://uploads.strikinglycdn.com/files/79b662b1-0529-461e-8d9b-4a6675acca85/82644780339.pdf
    • https://s3.amazonaws.com/najubu/pimojodutowelu.pdf
    • https://s3.amazonaws.com/daraniwekamidir/discrete_mathematics_questions_with_answers.pdf
    • https://s3.amazonaws.com/jenagubadopi/apics_bscm_study_material.pdf
    • https://uploads.strikinglycdn.com/files/0ea3f143-028e-446f-a1e6-4c26a4f4a141/48520220669.pdf
    • https://s3.amazonaws.com/tipikaxe/nest_e_thermostat_manual.pdf
    • https://s3.amazonaws.com/bidurudilidujug/fasufowutirajonuwe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab23.bin
7f6de66ef135cb6770e136b4180c678f592c44387facc012ee430256b31fbd9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB23 5040 bytes
font_01_sfnt_off0000bc57.bin
7e674b00d115f42ba28c516bec9ce673981dd048df6a5f47d17002139e2ab229
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC57 9944 bytes