Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f357399b730fd5…

MALICIOUS

PDF

73.1 KB Created: 2021-04-06 06:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 76bf88d7616f32bff707f4b67cc14ca2 SHA-1: 5ac22175bb9c9f325c0099178d3eabfa3e283243 SHA-256: d3f357399b730fd518d596ea636d828bd21892245c4890702f17185adce9eb4c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://midufefew.ru/wix?keyword=dyna+garcinia+diet+plan PDF link annotation
    • https://cdn.sqhk.co/vedoreket/asJjfjh/xotufozifolitexasamaw.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/jepifa.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/74847849085.pdfIn PDF document text
    • https://cdn.sqhk.co/gezefesete/hfhgOje/sozakosanafujozapusafiser.pdfIn PDF document text
    • http://fuxanujibiz.mygamesonline.org/fly_tying_vise_reviews_2020.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/a5d43cb9-c8a1-4c45-af58-20bc7a5c674f/how_do_sharks_protect_itself.pdfIn PDF document text
    • http://vukotirigepiv.epizy.com/javascript_reference_types_string.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_506d2951c584420b8dc870a76663322f.pdf?index=trueIn PDF document text
    • http://wewugibujo.epizy.com/cards_against_humanity_6th_expansion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98226299-433d-405c-a100-0755cf1e28b7/moliloromikuwizepebipas.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/where_is_the_republic_of_tea_located.pdfIn PDF document text
    • http://marelifi.rf.gd/libro_azul_autos_usa.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_8cd51be13029418f968f26fcd488e043.pdf?index=trueIn PDF document text
    • http://jaxegowanav.rf.gd/3322570808.pdfIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_fbba8a97872f4055be2800468e95a62f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ninasivol/roku_express_3900x_manual.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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 5164 bytes
SHA-256: 417193f67a06acbfd8a9c2a1628a71b50716b9172ac08a1d183e83b3be3ed413
font_01_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 11124 bytes
SHA-256: aed2026a2f103d8c9ec5e9b05d64eddc54502704a624be6abcd357b1e7087846

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