Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f7aafbe613e91e…

MALICIOUS

PDF

72.4 KB Created: 2021-02-15 19:26:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3a4d3cf4608864a7e1c51387ec9104e0 SHA-1: 647c1caf4619c7c4b6fcde7222a80859146d1601 SHA-256: a6f7aafbe613e91e48426c370fcf5078bcbc2a09bfcfe8ce23aa5253a3d6d3a0
224 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains numerous embedded URLs, some of which are invisible, pointing to suspicious and disposable domains. The ML classifier also strongly indicated maliciousness, and ClamAV detected it as Pdf.Phishing.Trojan. The presence of these indicators suggests the file is designed to lure users to malicious sites, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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://yafferge.ru/strik?utm_term=my+ac+unit+will+not+turn+off In PDF document text
    • http://stakingyfi.com/el_completo_manual_del_suicida_onlinex3786.pdfIn PDF document text
    • http://imkl-checker.com/dugewefawaku0uujh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_6013934405a5e.pdfIn PDF document text
    • http://reactivascotia2020.com/answer_the_question_and_earn_money_appu130b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_5fd882a895b89.pdfIn PDF document text
    • https://rikusinifo.weebly.com/uploads/1/3/4/0/134017093/rorofatejixib.pdfIn PDF document text
    • http://managerprogram.live/43591023344falbn.pdfIn PDF document text
    • http://wulodab.iblogger.org/71676133159.pdfIn PDF document text
    • http://blablablacar.online/visual_workflow_developer_guidewicvw.pdfIn PDF document text
    • http://universe1.space/sociology_a_level_textbookayozk.pdfIn PDF document text
    • https://nemanuvipiza.weebly.com/uploads/1/3/1/3/131398236/1425434.pdfIn PDF document text
    • https://felabare.weebly.com/uploads/1/3/0/7/130776415/4058913.pdfIn PDF document text
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/jusakigoruruni-banalo-larikigi-xekawisuz.pdfIn PDF document text
    • http://mmeueue.space/nom_036_stpser7ep.pdfIn PDF document text
    • http://detonic-ro.website/vedivuxonekigavubarubeganzheda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 4896 bytes
SHA-256: 8dc570a1636e8325165e19da5b496bebe83556ce67db8c18c80b1479f10d347f
font_01_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 10784 bytes
SHA-256: 58ac5f691e2e19701e6625bef36eacedae3c40b4aae9b7b20eda2d99a6670886

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