Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbd617a035da355…

MALICIOUS

PDF

80.1 KB Created: 2021-06-10 03:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9edbf45526471fff70b1a95270d9d86c SHA-1: 694677fbb2b1ddcab29adddd8ff9789a3bd00bb8 SHA-256: 2cbd617a035da35596efd7ded504df46a378f561366f365b4f219fc7fdbfb507
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, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/pbw?utm_term=how+to+retrieve+files+after+factory+reset PDF link annotation
    • https://tamusibexo.weebly.com/uploads/1/3/5/9/135966636/xedokozozefafanukom.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/laligifoko-zuwibutewiku-gitelinevolusub.pdfIn PDF document text
    • https://xulegavumorojok.weebly.com/uploads/1/3/0/8/130813780/ditarazidolulob-noravebiwox-xorizirabo.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/0de7db92ddf.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/4782901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_600bb7f89638b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496824/normal_601675dbd4504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5fdad495c0550.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366653/normal_600000acb41e4.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/vexizopizonokiwiji.pdfIn PDF document text
    • https://zesujejiviwi.weebly.com/uploads/1/3/4/7/134729849/28fbbea2fd5b097.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/0672946a-cea0-40bf-8605-7ff62a536cde/how_to_get_started_writing_an_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d258b59f-e4b2-4620-bdda-b5f5ca9398d1/zivubatuviwilogagof.pdfIn PDF document text
    • http://pidexuxok.pbworks.com/f/94797912736.pdfIn PDF document text
    • http://niluputevi.pbworks.com/f/44741731462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2b37ac-8878-4809-bd2a-fb04568807d7/nojirimekasekisini.pdfIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/144633549/sf_tenants_rights_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4653916a-e00b-460f-b6fa-cfb6961a92d1/77686101104.pdfIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/144942852/remewela.pdfIn PDF document text
    • http://kesowununak.pbworks.com/f/9293561640.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_off0000fd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD14 5088 bytes
SHA-256: f641c6ff38fe9f1b47534cf0c5bb50c470433f70833555fe7907fbd17cf9b5de
font_01_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 10588 bytes
SHA-256: 2d2b0dd6e3f1f513fe93530ae2625025539f82d591882b36dc93d5047506ecb0