Malicious PDF — malware analysis report

Static analysis result for SHA-256 11315ef07a632247…

MALICIOUS

PDF

89.3 KB Created: 2021-03-30 11:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0c4639af49a418bede53231347ce01db SHA-1: 5281a5268f9d5279f10c70a5f8a0d99d460ba25e SHA-256: 11315ef07a63224778539202187dbce37c7dee3c6077e6f0555bed55395eabfb
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://jacksth.ru/strik?utm_term=dark+souls+remastered+ps5+performance+reddit PDF link annotation
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/2e7584ecb860df7.pdfIn PDF document text
    • https://laximazerafa.weebly.com/uploads/1/3/4/2/134235816/nisib_sakezugasuxozis_lirowivux.pdfIn PDF document text
    • https://ritukananikunid.weebly.com/uploads/1/3/0/9/130969552/b181e102954351b.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/c2839.pdfIn PDF document text
    • http://dexujin.iblogger.org/31176232175.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/wodosij_rijiku_fidoz.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/e5614c85-a405-4239-aacd-b7ad8ab4ef97/thermo_king_stockton_ca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb908bbb-845e-49d1-942d-964d471e3b07/lowazoxatefipagalev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6616da-c4fb-4739-b0fe-895ca104d44f/92663882896.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/nevati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e677ff4a-f39f-475b-8727-1deaa3ff3344/hague_water_softener_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec62b35-5f6e-4e58-bf6d-fac0ff879fe1/77661054486.pdfIn PDF document text
    • http://xokopaxitake.rf.gd/83200573400.pdfIn PDF document text
    • http://gevosumol.epizy.com/2177807699.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/java_mac_os_mojave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc67999-0deb-4d5e-8953-c994c3e7fa0e/explain_the_three_estates_of_french_society.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_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 5488 bytes
SHA-256: f342afdf421c8ebcb868a816eadb02bb60a625c8fe614a3ce8607f515969e941
font_01_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 11468 bytes
SHA-256: 52bc52e553ee7ba87a9c754260febc8656b1be5f825a22c3a0b875adb5470fb3

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