Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e6b508088f0e6b…

MALICIOUS

PDF

75.1 KB Created: 2021-02-19 16:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 65b984fbd9e110fc8c136e1ab88d6127 SHA-1: a4e216f1cacf5dac77f2f39b051518bebc9f3228 SHA-256: b8e6b508088f0e6bf62bd705203e62d728e2d4688996dbb382096f7f2b09cf5f
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 high likelihood of malicious intent. The document contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO spam. The heuristic 'PDF_SEO_LINK_FARM' specifically flags the presence of a mass external PDF link farm, suggesting the primary purpose is to redirect users to a network of other PDF files, potentially for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself could facilitate the execution of embedded JavaScript if present, leading to further compromise.

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://baarspo.ru/wix?keyword=living+like+weasels+sparknotes PDF link annotation
    • http://silkhfig.bid/find_my_iphone_icloud_lockjsqmf.pdfIn PDF document text
    • http://govnososal.xyz/vogereloxilopaspd65.pdfIn PDF document text
    • http://neuroncraft.online/company_of_heroes_2cdpm9.pdfIn PDF document text
    • https://wusaveverafojiz.weebly.com/uploads/1/3/4/3/134338410/9781094.pdfIn PDF document text
    • http://profaudit32.ru/790550257007s632.pdfIn PDF document text
    • http://forecast.bet/bedadewh496v.pdfIn PDF document text
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/fe6824c.pdfIn PDF document text
    • http://filmera.ru/7561030013wylqr.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/ponuz-karelupewulefo-gokefa.pdfIn PDF document text
    • http://latuha.com/random_four_digit_number_generatorhed60.pdfIn PDF document text
    • https://dixatuwep.weebly.com/uploads/1/3/5/3/135398053/rinidinuru.pdfIn PDF document text
    • https://vowabogebem.weebly.com/uploads/1/3/0/7/130775978/kixisirikirav.pdfIn PDF document text
    • http://srakan.space/ssc_steno_2018_admit_cardvkuvo.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/f5242fcd271eb14.pdfIn PDF document text
    • http://sushibara.net/friedberg_linear_algebra_5th_editiont7hb3.pdfIn PDF document text
    • http://kmikaerfs.ru/what_is_the_best_solar_security_lightvhq04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 4932 bytes
SHA-256: 0422139f89f8e1f18e6f72fabd5d4e858cd062b66bbb7c84b45f227e3e9d68ba
font_01_sfnt_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 10072 bytes
SHA-256: 344387d16c2091e92cc1144b11a74c248b70f3fdce466b02c4259db66354703e
font_02_sfnt_off000110ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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