Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2860ef1f1b417c…

MALICIOUS

PDF

76.4 KB Created: 2021-03-20 12:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3215a8a510027c5b235a9443b4164e12 SHA-1: 07e091f5f1d32df9dd282c1b70f30c2bd69de1c6 SHA-256: 3d2860ef1f1b417cb0b9168b723ca6539cc1a7d72ecd19d05b8f2a902882bbaa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL pointing to a suspicious domain ('maypoin.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=biblia+reina+valera+1960+en+espa%25C3%25B1ol+con+audio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384628/normal_602fd0df4acae.pdfIn PDF document text
    • http://istlan.fun/macrocephaly-_capillary_malformation_syndrome_symptomsehp4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_6020fb9a39c21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5fc9279ac1021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_604d3bd4066bc.pdfIn PDF document text
    • http://miiliioner.xyz/voice_recorder_appud50e.pdfIn PDF document text
    • http://1eyvgo.xyz/rectangular_prism_templaterpc8m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488335/normal_60385610ad717.pdfIn PDF document text
    • http://stavki.link/45974900401blmzp.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/dovulavavo/13929527629.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/adobe_systems_incorporated_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/20531260744.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_844bd092808e408c8e6e880e71ee7d15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/86795576311.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_472197d18ce44db69297f8b20163e2ea.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9B 5836 bytes
SHA-256: ed0a4b3507bb477de937b362f4b31cf72dccca9d8acac2cb879d256a62269cf7
font_01_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 1940 bytes
SHA-256: 3f23ae85e37b15402f879ea150537e7cb0ed239a072db7b6928757f1c19d6afc
font_02_sfnt_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 12232 bytes
SHA-256: a87dc26905b1643ae6f197a7a70cdfced078e419ff4683cdc67539b339228436
font_03_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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