Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8e649cc0e1aca4…

MALICIOUS

PDF

82.8 KB Created: 2021-03-21 07:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 7509b610cda5762b2ce4fac0c5417d0e SHA-1: 52aaf280cd69f3f4701cd4b943628d192675e93f SHA-256: 0a8e649cc0e1aca4c199a3bb2cd8aa84c71a71697f405aa6bbf2435b8048ceac
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to literary resources, likely to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://lozipotod.ru/wix?keyword=recursos+literarios+en+ingles PDF link annotation
    • http://doucheapp.xyz/can_i_watch_youtube_on_kindle_paperwhitel215m.pdfIn PDF document text
    • https://rofozewoguse.weebly.com/uploads/1/3/1/3/131384025/sudanezitovev.pdfIn PDF document text
    • https://jukovuwivoxufab.weebly.com/uploads/1/3/3/9/133997180/kotigesiduji.pdfIn PDF document text
    • http://tk-time.site/85189246621skvic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373505/normal_5ff6ad2c5276e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416136/normal_5fee6324b8368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381541/normal_5fec71bf8205f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490929/normal_602e5a0bcae3b.pdfIn PDF document text
    • https://jevupatumatawi.weebly.com/uploads/1/3/4/3/134377955/lixosipikeluwe.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/kodipopujufipig/derecho_romano_vulgar_que_es.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/marine_safety_officer_vacancies.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/cool_math_games_hangman_answers.pdfIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_d8fcfe0ba5844d97ae7eaa4403cd3df9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/ph_e_o_meio_ambiente.pdfIn PDF document text
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_201763e7d70e4034a0092e8d0450f81b.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_2ed2c1e0185a4d058b310678d3525c50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/76853167538.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 4856 bytes
SHA-256: 0187ab2b34c9132327f773a13f706b0631b347165d94c2c6a26f2b861993c6d3
font_01_sfnt_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 12208 bytes
SHA-256: 8bf083220cec0aaf0ad7becbcfffc15978e2a519921e64f94648db403b33c0e9
font_02_sfnt_off00012eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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