Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ec2de44395b351…

MALICIOUS

PDF

75.2 KB Created: 2021-02-22 18:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4190eecf5f30552c288cc9f3235e8a16 SHA-1: fecb6ddcaf070880cb02a1c86372a386cdcc8a10 SHA-256: a6ec2de44395b351b457bf8b3398c32b7e7657837ad5ba1db8341a9a468c3005
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

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
  • 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.
  • 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.
  • 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/aws?utm_term=how+many+types+of+meter+in+poetry In PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/1127634.pdfIn PDF document text
    • https://cdn.sqhk.co/lijusute/bhg8hij/dream_town_story_hidden_combos.pdfIn PDF document text
    • http://j3vnci4.xyz/boxometofo4t2cj.pdfIn PDF document text
    • http://exemplpusj.com/papunevedegemezewzlksu.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/5d7df6e4fdbca.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/jomoso-bivimuzi.pdfIn PDF document text
    • https://diwekivoveludu.weebly.com/uploads/1/3/5/3/135313391/b54be03.pdfIn PDF document text
    • https://newimogo.weebly.com/uploads/1/3/1/0/131070302/telapojivefupig-rabazog-pezep.pdfIn PDF document text
    • http://8gusevshop.space/journey_to_the_center_of_the_earth_full_movie_download_dual_audiog5jsv.pdfIn PDF document text
    • https://nawiwunusuwo.weebly.com/uploads/1/3/2/7/132741181/medafivejikur_levoko_dedonidakew_pifozomup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382793/normal_5fcbf05f81b95.pdfIn PDF document text
    • https://cdn.sqhk.co/komukopa/jIheji2/percentage_off_calculator_mini_web_tool.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467325/normal_6006bac320106.pdfIn PDF document text
    • https://kiragidemi.weebly.com/uploads/1/3/0/7/130775435/dinom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_602400eb262c4.pdfIn PDF document text
    • https://widavobixi.weebly.com/uploads/1/3/4/4/134494271/1e3f4f5c880c91e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewatolod.rf.gd/bzun_stock_earning_report_date.pdfIn PDF document text
    • http://vutilunero.rf.gd/superdry_ladies_xl_size_guide.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_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 5172 bytes
SHA-256: e907704f24c52a4a7550c0acd9da345466d448ea41737b207afc8a04270303d1
font_01_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 10380 bytes
SHA-256: 8a7ae9094bee7ae43f9986b218bde7cf015e5ca0c8ea7042a192c588fb5a0a70

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