Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17ab23e14850dd8…

MALICIOUS

PDF

75.0 KB Created: 2021-03-26 08:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4cedcbf2c355caa89263c04398fe6429 SHA-1: ce316028ce02b6f9887bd53c0e280d380a7898cf SHA-256: f17ab23e14850dd863e00f8a0b2ffc54bd2b8207ac63bd802d31f72143364fd4
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://jacksth.ru/wix?keyword=income+limit+for+peachcare+2020', appears to be a lure for potentially malicious content. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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/wix?keyword=income+limit+for+peachcare+2020 PDF link annotation
    • https://cdn.sqhk.co/mujejadalale/ghcjdja/liver_cake_recipe_for_dogs.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/ShgewDX/knight_of_wands_love_outcome.pdfIn PDF document text
    • http://gemaxumaweti.22web.org/warhammer_age_of_sigmar_path_to_glory.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvidomanale/djbcije/learn_different_languages_free.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/88586016014.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/AFMicSL/century_21_near_me_manhattan.pdfIn PDF document text
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/sonefuson.pdfIn PDF document text
    • https://rarozevalir.weebly.com/uploads/1/3/1/4/131437937/6445679.pdfIn PDF document text
    • https://jopazidavasuzu.weebly.com/uploads/1/3/2/6/132681438/lumufavaxedofudotiza.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/7664314.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/cKbhhja/29951470571.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nipesuvaz.epizy.com/mai_teri_chunariya_lehrayi_hd_video.pdfIn PDF document text
    • http://sadakukozami.rf.gd/saregekanatobonajaxit.pdfIn PDF document text
    • http://dilizefolu.rf.gd/organic_acids_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9686174b-dacc-4a28-bb4e-e27bd1c50989/dotupulegomajuleritanulok.pdfIn PDF document text
    • http://bozagasixafovo.atwebpages.com/purpose_driven_life_journal.pdfIn PDF document text
    • http://rujemivegelap.epizy.com/756995717.pdfIn PDF document text
    • http://tojozojorezew.epizy.com/guxotixerobamunegilavev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c7d00a-86d1-4cc7-8b08-1e7d2be27d9a/6199109678.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_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 5288 bytes
SHA-256: 8ab3874e75563636bcfa77ad6f29e691470a1db21b23b470efed96c042b02564
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 11484 bytes
SHA-256: 9326890e6ad5e059ef8ca10325e8d3dc2ab62f94c7f3aad9c137b6220f9531a4

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