Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e84c5f98f8b71c…

MALICIOUS

PDF

73.1 KB Created: 2021-02-20 16:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 285a44fdea4679f20fa47d7ff629ae02 SHA-1: 523369afd23612244fa6458017545df04f4be89b SHA-256: f5e84c5f98f8b71c06f7c9f12e9e34d427b97682b9f5bc92606183ae2b9b60c9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, with one prominent URL leading to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious document designed to redirect users to harmful content.

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 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://baarspo.ru/aws?utm_term=most+effective+hand+to+hand+combat+weapon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412583/normal_6023fab10cb87.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/mavugag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423137/normal_602c4a0e071df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_5fd8e93466e0b.pdfIn PDF document text
    • http://voirlo.xyz/govowinewegerazononukiluzzaq2r.pdfIn PDF document text
    • https://xetupowo.weebly.com/uploads/1/3/1/3/131382232/tagoweba.pdfIn PDF document text
    • https://suwesinorilofev.weebly.com/uploads/1/3/4/0/134096988/5621189.pdfIn PDF document text
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/5269273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_600ebc841ca0c.pdfIn PDF document text
    • http://zarabotok.space/overlord_light_novel_volume_1sqfwx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426423/normal_5ff8ff4ca43a9.pdfIn PDF document text
    • http://dommasters.site/geographic_information_system_ebookkfc9l.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/elements_of_engineering_electromagnetics_sadikunc3bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xediguvodolej.epizy.com/vonatubidozo.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/annals_of_surgery_author_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/zuwokamanuwogukuzomemu.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/loxifetobavux.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/chappal_chirugali_telugu_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/energy_transfer_worksheet_middle_school.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_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 5564 bytes
SHA-256: 6ac45d5d72f30413a543dd8a84c2df5d3036d89927f96e5dcbfccf67078bff55
font_01_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 10748 bytes
SHA-256: 14613b32f15b72924ef1cce28932557ecf464a0eb64838afab07c4a93f54d948

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