Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0053e04aa425654…

MALICIOUS

PDF

78.0 KB Created: 2021-03-30 23:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 183865e6273ba80a66a397556a34c31b SHA-1: ad7dcdd30e9d859685022fad1d442915d5d5138d SHA-256: a0053e04aa425654d30d2e3fa9f54c080982eaddf6d5bc00764ceac3839715cb
126 Risk Score

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 0.9998

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://jumiwimov.ru/award?keyword=breastfeeding+elimination+diet+pdf PDF link annotation
    • https://dibovasejul.weebly.com/uploads/1/3/1/0/131070518/gumirofejotiwebikazo.pdfIn PDF document text
    • http://togaxifobuf.mypressonline.com/rakatelivojeme.pdfIn PDF document text
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/a9d3772403.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxejelun/ajb7wge/best_antivirus_for_pc_windows_8.pdfIn PDF document text
    • https://jivupofa.weebly.com/uploads/1/3/1/4/131406879/gilaruzezox_jakomerevumoliz_rarurotapi_bepobiwigu.pdfIn PDF document text
    • https://lezanaxowap.weebly.com/uploads/1/3/2/6/132696506/7547254.pdfIn PDF document text
    • https://mebotorafegamor.weebly.com/uploads/1/3/0/7/130739377/e608fc617b1161.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/galirezaxi-netobab-vunatovuredix.pdfIn PDF document text
    • http://frankiearvelo.com/66884137113s89rs.pdfIn PDF document text
    • http://academic-club.ru/bomoverefesiwagibx.pdfIn PDF document text
    • https://fovibera.weebly.com/uploads/1/3/5/3/135324383/7808073.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/gmihgdx/85161727831.pdfIn PDF document text
    • http://namabal.scienceontheweb.net/84705097599.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/24606582576.pdfIn PDF document text
    • https://cdn.sqhk.co/badilapo/TXayMjb/dokivigavujakoxobopinuro.pdfIn PDF document text
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/wulivuxal.pdfIn PDF document text
    • https://jamolirotiwe.weebly.com/uploads/1/3/4/6/134693152/jerefusogub-wowawosubev-dodokag-xulazamewiwed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekemelegewimo.atwebpages.com/what_is_an_information_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/xuteba.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/pokuvaju.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_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 5408 bytes
SHA-256: 87b4c9469f175515ea24f7f67debee3b3db1e4cd9e449c7d893bbd5ad9fbe0d5
font_01_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 10568 bytes
SHA-256: 3e0b9b2733300c2186435a35af5dfd63a04175ea4a531b3449c3fd3bedc2a503

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