Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d791ade75b3d71…

MALICIOUS

PDF

68.6 KB Created: 2021-05-29 13:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: df17674ab025d1cb0e12b3a10b3f4c45 SHA-1: 1d9f0815f3a7378dee607a29100433c634bb8629 SHA-256: 01d791ade75b3d71b6c34ad52f87713dd8015980f944c48d76832db1c8681317
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

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://jacksth.ru/strik?utm_term=mean+median+mode+range+worksheet+kuta PDF link annotation
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/ginelelorifakizetow.pdfIn PDF document text
    • https://salotoniv.weebly.com/uploads/1/3/5/3/135305201/damizukuvavo_posorebeluvevi_navorebifujup.pdfIn PDF document text
    • https://lefoxidegej.weebly.com/uploads/1/3/4/5/134526886/nufagiv_vurexarefimukun_mawige_werifigironupus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494436/normal_60322e3b75d9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486365/normal_5fc90a6e15a50.pdfIn PDF document text
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/bofipiw.pdfIn PDF document text
    • https://lejimawemo.weebly.com/uploads/1/3/0/7/130739028/vobugemenefiba-vasonom-vilaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_602e1b1b806e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_6056b7026ffe4.pdfIn PDF document text
    • https://tomolipuxoris.weebly.com/uploads/1/3/4/7/134708775/7593153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447885/normal_604e3e6ff4175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425491/normal_6060515270e54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58fb0ef-843f-4cee-9872-06e5c47308fc/81196495819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c3797f-1d90-42df-a967-570af73424c3/what_are_some_good_persuasive_essay_topics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b2eb40-6e0d-407a-99c5-0b303bb63ecb/how_to_determine_grit_of_sharpening_stone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cb5bcbd-134b-4e84-8297-dc021bbb7c56/rigumijosuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a517f214-66b5-436d-a67c-375068b7de58/how_to_make_simple_syrup_sugar-free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0924b13-b33e-4a18-adc7-16b585eebafd/upfront_magazine_answer_key_november_2_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80fcb395-c761-478a-91f9-53d7704ef565/nibafevefavobekunokipetub.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_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 5368 bytes
SHA-256: 46ae99f80d5438d8550fcebf7266454dd1dcc3b84325a79303aa1cbb344dd3c0
font_01_sfnt_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 10372 bytes
SHA-256: fd874af04301c066ef751be79bc109d53f3c7416a8f2d80f1ad933261714d95d