Malicious PDF — malware analysis report

Static analysis result for SHA-256 4439339ba948be84…

MALICIOUS

PDF

68.3 KB Created: 2021-01-14 12:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ac2f7d7c4f9067dcfd4fafccfb13754 SHA-1: 70542ac2ac7e4bc7dfc4c17852bb0395100e5fbc SHA-256: 4439339ba948be8418f3db1bd245aa896a0dba6c545b4b9e0379931306935cd6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable hosting services, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://trafftec.ru/123?utm_term=grey+cloud+elementary+calendar
    • https://site-1178022.mozfiles.com/files/1178022/diamonds_from_sierra_leone_kanye_west_lyrics.pdf
    • https://site-1177895.mozfiles.com/files/1177895/17555895493.pdf
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f8ff6a61b4e8.pdf
    • https://vajoribenokajug.weebly.com/uploads/1/3/4/7/134713142/4ba43f5649.pdf
    • https://lavuzolitad.weebly.com/uploads/1/3/4/3/134327879/5419106.pdf
    • https://ralikinu.weebly.com/uploads/1/3/4/8/134883141/sunozul.pdf
    • https://sajogosekatoja.weebly.com/uploads/1/3/4/6/134682383/lugitutekironejuko.pdf
    • https://site-1177846.mozfiles.com/files/1177846/goosebumps_night_of_scares_chapter_3_walkthrough.pdf
    • https://site-1221949.mozfiles.com/files/1221949/75666092737.pdf
    • https://cdn-cms.f-static.net/uploads/4450504/normal_5fa7c8aa393aa.pdf
    • https://site-1167928.mozfiles.com/files/1167928/3026967144.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sixolose/nerurasakixiwor.pdf
    • https://s3.amazonaws.com/tenunud/nothing_bundt_cakes_confetti_bundtlet_nutrition_information.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_off0000cee7.bin
39dfb03132c97417d59f7d13e052a526dc6c8da3a49ab2b62a5a90ec2bac4cdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE7 5040 bytes
font_01_sfnt_off0000dffb.bin
2fe9e3723cf4215453c4a8f2b3da92511008a915ecee9e6f3c04e0076dd209c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 10712 bytes