Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf7716c80b8d08b…

MALICIOUS

PDF

82.6 KB Created: 2021-03-18 12:04:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d5139b6aaf27d4a04ad954758af9df1f SHA-1: 602cd11130c9ddd5c061f4bd0deac47fd03e657b SHA-256: 0bf7716c80b8d08bd9c43daa1301413cd4d6d6d40ad03d494089afb9b5326338
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 pointing to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further payloads. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/123?utm_term=cognitive+behavioral+therapy+pdf+judith+beck PDF link annotation
    • https://mulunumidivopiz.weebly.com/uploads/1/3/5/3/135393794/repuxopepekimis_vawetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401985/normal_602560f1e3fcd.pdfIn PDF document text
    • https://vesovagesigopek.weebly.com/uploads/1/3/4/6/134614223/zuzivuteliparelikuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496146/normal_5fd77c0ae79a0.pdfIn PDF document text
    • https://loxufoxoxow.weebly.com/uploads/1/3/5/9/135982175/gerove_xopava_zejitiwovurudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505159/normal_5fdd3c3246012.pdfIn PDF document text
    • https://jutonoxefakevuw.weebly.com/uploads/1/3/1/4/131454335/cd4af86e0.pdfIn PDF document text
    • http://xiletunekukine.iblogger.org/convertir_a_word_sin_programas_online.pdfIn PDF document text
    • http://getdouche.xyz/what_is_an_assignment_in_contract_law8jmrf.pdfIn PDF document text
    • http://fb-ig-copyright.com/what_company_owns_schoology771l9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415321/normal_5fe78177d6b67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_600a101a67840.pdfIn PDF document text
    • https://rirofogarerena.weebly.com/uploads/1/3/0/7/130775169/powusudixex.pdfIn PDF document text
    • https://pupaxuge.weebly.com/uploads/1/3/4/0/134096873/mulaka.pdfIn PDF document text
    • http://gaduvokine.iblogger.org/zebra_gk420d_technical_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ximedamolaxeve.epizy.com/42036230751.pdfIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_d9b14aa55f364b9d8e09bdb836f0f853.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_a2e961b4c39f43a49cf9a9e07f743443.pdf?index=trueIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_42eae70d29c244d09afead64139938d7.pdf?index=trueIn PDF document text
    • http://xatonidolib.epizy.com/donisukelupiwofarojurivu.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_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 5584 bytes
SHA-256: 05a566a6f46b8662338d76cfe5bb030380f6a44d26c3be68f6736564d8a01213
font_01_sfnt_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 10952 bytes
SHA-256: 4444b6c756737fcae04c98418ccc027c7de8d085f8e3190add87b8056462a618