Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec8a37bba576547…

MALICIOUS

PDF

80.1 KB Created: 2021-03-18 20:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbcc19a3b70e8a1ad2b3183784fdf5c2 SHA-1: 7d52cbe5b4d5d08b5240ecc4426e0a9a61b2016c SHA-256: eec8a37bba5765472488b95582e4428be69a900ef14d92c2dac998661d3a67a3
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://xezojetit.ru/strik?utm_term=is+the+first+word+in+parentheses+capitalized
    • https://cdn.sqhk.co/muzedikerum/biirCgR/72558104803.pdf
    • https://satataro.weebly.com/uploads/1/3/5/3/135350270/miwuxapetenu.pdf
    • https://static.s123-cdn-static.com/uploads/4485172/normal_60090afdd2f29.pdf
    • http://olivamebel.com/dilamasufub2ifyb.pdf
    • https://vafumuwolefuz.weebly.com/uploads/1/3/5/3/135325426/730cce1e1e5.pdf
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/f019a5.pdf
    • http://helplnstagramoffice.com/86556170950xmz2u.pdf
    • https://static.s123-cdn-static.com/uploads/4371005/normal_5fef650d64356.pdf
    • https://cdn.sqhk.co/redexisa/jeghcie/war_robots_mod_apk_unlimited_gold_latest_version.pdf
    • https://cdn.sqhk.co/xixujipum/hngghcz/7611338184.pdf
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/nazozixekumu-nogovevixike-milimetof.pdf
    • https://cdn-cms.f-static.net/uploads/4376120/normal_6044d3b1a171b.pdf
    • https://static.s123-cdn-static.com/uploads/4482853/normal_5fe2571a3bcca.pdf
    • http://fapseo.ru/how_to_clean_ge_top_load_washing_machine_filter3k2el.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_beb7f898f31b448c9dd33a632a84225b.pdf?index=true
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_2477df4929a94203910b750dc67e8929.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5af.bin
750fa70790dd62c188abc92ce344242b317d67e2a5cbb1fbd5af519871b126d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 5320 bytes
font_01_sfnt_off0000f7e1.bin
8687735db19c7ec2f663b4851d03e1004f85ee7256b646a80d8f0ac5e110655d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 11024 bytes
font_02_sfnt_off00011d90.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 16204 bytes

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