Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea67d50870ae3d68…

MALICIOUS

PDF

84.8 KB Created: 2021-01-26 13:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e246211294a2fc18e4f6b86363282351 SHA-1: 727af3cb970b4e91c9798183442763b80bd117ca SHA-256: ea67d50870ae3d68cc9b106d7b261bfc0122ffd3742b5a751ee8c815a9534e88
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 hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=swtor+little+boss+guide PDF link annotation
    • https://cdn.sqhk.co/narulaloro/pgdkeji/subterfuge_make_a_sentence.pdfIn PDF document text
    • https://gefobivuvevu.weebly.com/uploads/1/3/1/3/131380717/xetixuju-vitofutix-refaruwozukodut-tutofoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413848/normal_5fcc7b7fe04bc.pdfIn PDF document text
    • https://cdn.sqhk.co/vifutetax/PhgL23w/shift_key_toggle.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/gejbgi1/puvujug.pdfIn PDF document text
    • https://butavuzi.weebly.com/uploads/1/3/2/6/132682386/3826184.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/bhdaLha/cute_wallpaper_kawaii_food.pdfIn PDF document text
    • http://womans30planet.com/joribikosijirafudewzokl3.pdfIn PDF document text
    • http://mjawebdesign.net/duxigumodejekabareegb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402720/normal_5fc74e1f613e0.pdfIn PDF document text
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/wireruzikojixa.pdfIn PDF document text
    • http://wide-mean.top/shutter_speed_camera_app_for_androidy04py.pdfIn PDF document text
    • http://fasad-dom.site/samsung_galaxy_xcover_4s_pricerunnero0h2l.pdfIn PDF document text
    • http://laura-egorova.ru/samipisenarudrzid8.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/DjcORjh/stickman_dismounting_glitch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 5116 bytes
SHA-256: 9d2a7c6fd0d68f08f3f81f5ff3a44a16dd6b9085b511e073b40432970214b15c
font_01_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 13596 bytes
SHA-256: 7da9350e2c53105cb268cc45b77fa8d0a4b3631212dc6d64d6591030a11d6de5

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