Malicious PDF — malware analysis report

Static analysis result for SHA-256 c644f25406b7aa7f…

MALICIOUS

PDF

83.2 KB Created: 2021-03-16 02:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bab5f8d3fc0a46bca097bdc9a27c4262 SHA-1: e12f217060bad7dd8f5529e35a2c244c3fae28d7 SHA-256: c644f25406b7aa7fd8b77a96a5a3c44fa34ed6076245e5434250db512d2c586c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting and structured as link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to download potentially unwanted or malicious software, likely disguised as free software.

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://resalured.ru/wix?keyword=pandora+one+free+apk+download+for+android PDF link annotation
    • https://foxujutuz.weebly.com/uploads/1/3/4/3/134348357/bibabaxa.pdfIn PDF document text
    • http://lozhobelir.space/beretta_92a1_review_hickok45r8ewr.pdfIn PDF document text
    • https://ludutuwe.weebly.com/uploads/1/3/4/6/134687162/5082796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_600de15be0e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_6017052900aae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449602/normal_5fecc49ff3632.pdfIn PDF document text
    • http://yoga-fitness.space/whirlpool_bottom_freezer_ice_maker_problems10lyj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482418/normal_5fc68f8221a45.pdfIn PDF document text
    • http://life-news.tech/346344284477mwah.pdfIn PDF document text
    • https://wotakowa.weebly.com/uploads/1/3/4/8/134885303/dfcb238383b8f0b.pdfIn PDF document text
    • https://rapironid.weebly.com/uploads/1/3/1/3/131398378/zefuzezesi.pdfIn PDF document text
    • http://allieshouseofhope.com/savosuti1vo31.pdfIn PDF document text
    • https://xuzitimezavut.weebly.com/uploads/1/3/1/8/131856372/7f39355d18ac5.pdfIn PDF document text
    • https://revawowi.weebly.com/uploads/1/3/5/3/135317167/kenezo_dapezo_zazajuji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/badlapur_movie_in_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/what_instruments_are_haram.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/alternative_zu_google_maps_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/86587350334.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 5016 bytes
SHA-256: fc7ee5e9b1194a209bce9cd0d3257cdef54dbfb6ce7fa3ed051fd0169bb71663
font_01_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 11220 bytes
SHA-256: 9ca0659d3e417c5c363d566cd1f4fd51b580819ceee0a77cb9b0e25208abb747
font_02_sfnt_off0001282c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282C 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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