Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8051eb5976c5863…

MALICIOUS

PDF

78.0 KB Created: 2021-02-14 17:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 103ae4c44946c2e2a10cecdd4a88e5c2 SHA-1: c7d87d818bb19a3621746e4e1a259327ebad1ace SHA-256: b8051eb5976c5863088515de07323c112bf4dfa19c816f19adb84dd900a817f7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains and hosted on services like sqhk.co, suggesting it's part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a keyword search for 'backyard grill portable bbq manual', indicating a lure to disguise the malicious intent of redirecting users.

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://maypoin.ru/wb?keyword=backyard%20grill%20portable%20bbq%20manual PDF link annotation
    • https://cdn.sqhk.co/pakiwujipubi/EEfgdia/vunedokebelufadifimida.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/reletiligovibexu.pdfIn PDF document text
    • https://vamemaxodoj.weebly.com/uploads/1/3/1/4/131437173/lujigakab-xivapodepugi-tugunoz-jugozutogapezus.pdfIn PDF document text
    • https://zekulereloto.weebly.com/uploads/1/3/2/7/132710655/sowevavibirivugebi.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/diihajc/54367439585.pdfIn PDF document text
    • https://cdn.sqhk.co/zebusukef/r9icEig/jennie_blackpink_fake_calls_prank_wallpapers.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/jgmqhjZ/regofivizopegugoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_600b26146166f.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/titubilusuzop.pdfIn PDF document text
    • https://dunawotota.weebly.com/uploads/1/3/1/4/131438316/9f1a55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460970/normal_5fdd64f301066.pdfIn PDF document text
    • https://cdn.sqhk.co/duburijudi/hhageja/unlimited_racing_fever_moto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5fde03da9232e.pdfIn PDF document text
    • https://gemuvubakada.weebly.com/uploads/1/3/4/4/134494784/kidiraroboluzaf_zogesosabo_bimafeladi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nimuwet/58412618579.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/autocad_2010_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/acute_hypocalcemia_guidelines.pdfIn 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_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 5696 bytes
SHA-256: e122a3680baf0ffc7f1c4893aabb946b32f58d0b8b003abdf1d64a7ae9e7d4fe
font_01_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 10820 bytes
SHA-256: e8014ae6cfa13371c154d4b32d65cd158146d9478cb3dff2d42464eedfe696a4

Open this report in the interactive analyzer, or submit your own file for analysis.