Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe03314e325b099a…

MALICIOUS

PDF

87.1 KB Created: 2021-03-12 17:54:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57952fb726b93218a87ff7f12427d742 SHA-1: ec2d340c3e3d05c0f51509416df7ad6b5cef8eea SHA-256: fe03314e325b099a0e49d051797ae44750e64d2c124139ccdce5a20dc8b18fae
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to S3 buckets, suggesting a link farm or content distribution network for hosting malicious files. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, and the ML_NYX_PDF_MALICIOUS classifier strongly suggests malicious intent. The embedded URL points to a domain associated with phishing, and the document body, though heavily obfuscated, contains keywords related to downloads, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=deep+learning+pdf+download
    • http://lovechat24.club/how_to_prepare_for_a_child_nursing_interviewrkauu.pdf
    • https://static.s123-cdn-static.com/uploads/4388416/normal_600319e09bef7.pdf
    • https://cdn-cms.f-static.net/uploads/4453764/normal_6037270db42ab.pdf
    • http://jushq.pro/que_significa_taller_en_ingles_a_espaol36vr2.pdf
    • https://cdn-cms.f-static.net/uploads/4419211/normal_6015b89479b19.pdf
    • https://cdn-cms.f-static.net/uploads/4375075/normal_60329d74dacaa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gowupuzokowuxes/buxukilerijuzew.pdf
    • https://s3.amazonaws.com/lekelepowo/xuroruwuluwuvukuvamobu.pdf
    • https://s3.amazonaws.com/jutenojamega/31667881298.pdf
    • https://uploads.strikinglycdn.com/files/9df0da07-44a5-4aca-92b7-17fa4bb768e0/world_map_with_country_names_contemporary_wall_decal_sticker.pdf
    • https://s3.amazonaws.com/tawovojo/75091184150.pdf
    • https://s3.amazonaws.com/tomaxade/69087153106.pdf
    • https://uploads.strikinglycdn.com/files/c34cbf1b-220f-4f19-8c9f-fb9ab9568af4/2005_honda_trx_350_repair_manual.pdf
    • https://s3.amazonaws.com/zibenoroduzuw/tinegajebedixup.pdf
    • https://s3.amazonaws.com/jivamubug/skullduggery_island_guide.pdf
    • https://uploads.strikinglycdn.com/files/5df50204-2f6e-4480-8bf4-b2d933772f3f/71743842506.pdf
    • https://s3.amazonaws.com/tawovojo/papubixi.pdf
    • https://uploads.strikinglycdn.com/files/26679574-86f0-4141-889f-d769b7f5a089/what_is_the_most_popular_donut_at_dunkin_donuts.pdf
    • https://s3.amazonaws.com/wujodibu/seragejofibate.pdf
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_0d8881b732c142b7910edfda892279d2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6cedd57a-ab5d-477a-b6d9-342fe3c46ec8/10436920205.pdf
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_f0bc25f847484d8eabde61c33780a78d.pdf?index=true
    • 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_off00011874.bin
d9080640b48ddbbd95d3f16995cab96228a5dfe4317ff09a192a6eb7795e2be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 5124 bytes
font_01_sfnt_off00012a0d.bin
5110658ca858ef6d43eec308594d301a171afc9761f54cf83944b4ad2522f76c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 11032 bytes

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