Malicious PDF — malware analysis report

Static analysis result for SHA-256 308388c3965426aa…

MALICIOUS

PDF

92.5 KB Created: 2021-03-15 22:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f725bfb368f058fe68567f06774c79ad SHA-1: 9f907d8b8650a338db7ad949683ad6696f8a9103 SHA-256: 308388c3965426aa0c03f7255e9d68f2dcda31a9536b9590d653b5a9646cf5b6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xezojetit.ru/strik?utm_term=what%2527s+the+best+cheap+midi+controller PDF link annotation
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/7172167.pdfIn PDF document text
    • http://zdorovienashevse.xyz/53007619292f45wd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5ff4bf176b716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_60405e614ed6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_601e4f9f9914e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fd1b6e0008e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_604d2e0c8a6f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_60110df13a9c9.pdfIn PDF document text
    • http://smeh-mif.space/vewowejumoduk7pmyp.pdfIn PDF document text
    • https://dobojadu.weebly.com/uploads/1/3/2/7/132711966/togaxivora.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493549/normal_5fca3969557f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_24c7e95a9225445c8f59a2a6ebb3fd95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5aba33-c9ba-4c21-9512-e884cbde3fb2/zagg_keyboard_ipad_air_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea35489a-b655-438b-92b3-89c1241e6be0/xusafanobufoxolevumorovo.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_b1193f68bc934e00bdd0473368de46b6.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_6781e32e1f06475b96e439e89e67f387.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c39dea-574c-40d0-b3a2-f0dcc056f1be/zibazesibozasesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185794dc-3ed9-46c3-9132-8dcb91490461/purposeful_life_without_education.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B55 5500 bytes
SHA-256: 475f6754b9caafeb57446cabac986f5b81268beac7ee5d18680c04484037cfa5
font_01_sfnt_off00013de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE7 11576 bytes
SHA-256: e58b9038e2a8491446d976a049460a38733da1dfdd1ac1936eb8a31fed4c2de8

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