Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab84dbd39cb3569…

MALICIOUS

PDF

71.4 KB Created: 2020-11-28 23:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 730d99e4b2fa93b5554df35f243ac5fa SHA-1: ac91fdf2098ea5e51e0993d0880e4266554e8f2b SHA-256: 4ab84dbd39cb3569ac573e99d0830e37476c1ec9ee9b59d36d9fe15876f30699
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 hosted on disposable domains, suggesting a link farm designed to distribute traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL 'https://traffnew.ru/123?utm_term=movies+extra+pack+for+3+months' is likely part of the lure to direct users to a phishing or malware distribution page.

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://traffnew.ru/123?utm_term=movies+extra+pack+for+3+months PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388617/normal_5f8d8eafd9000.pdfIn PDF document text
    • https://vefigemeg.weebly.com/uploads/1/3/4/3/134368147/wosubapanudo_xusutoboj_tetetokurenedu.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/15893feb1defe.pdfIn PDF document text
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/54f6e4.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/gevelogomupegu_batopitadem_ruwelepu_fikilumuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_5fc04da86d63b.pdfIn PDF document text
    • https://zanelonovubut.weebly.com/uploads/1/3/4/3/134315015/1bb04dbf4b90.pdfIn PDF document text
    • https://xeforosoxipu.weebly.com/uploads/1/3/4/9/134900432/mogigi.pdfIn PDF document text
    • https://wolalusajiri.weebly.com/uploads/1/3/4/6/134600438/tovunolipasofa.pdfIn PDF document text
    • https://zuparimetusu.weebly.com/uploads/1/3/1/3/131378993/maladewadujun.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
    • https://s3.amazonaws.com/vuzufexarevima/differential_and_integral_calculus_by_feliciano_and_uy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6505d1e6-f037-48af-ba0e-42f11ed0a92d/deathtrap_ira_levin.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/anestesia_general_veterinaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7079f7a-c86c-403c-a33f-6bcfb0d827aa/pci_data_acquisition_and_signal_processing_controller_driver_dell_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ec42fb-4aeb-48c9-9b6b-c1ced55b4167/54111204902.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B3 5372 bytes
SHA-256: 8fcef5179fe203854139249ff35e6761a9ebf7a91e387db3f9dbb3e69b98a426
font_01_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 11220 bytes
SHA-256: bb7b552f9cca0c4a426123fb83d0fd69be7768ac4eca5ad8480ea04e9de20589
font_02_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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