Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a238bb6e57c5dc8…

MALICIOUS

PDF

77.0 KB Created: 2021-03-29 01:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 971f00c96ff36cccd5b4df305401117f SHA-1: 98250e2512033ed380d990239db1cd720156bf92 SHA-256: 7a238bb6e57c5dc89fae9830c479c55940bf813b98db4487c560ffd204e523e4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of links pointing to disposable hosting and potentially malicious domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content.

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://botokaw.ru/wix?keyword=eldest+book+free+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413370/normal_5fc8144e0c340.pdfIn PDF document text
    • http://teksalon.xyz/monano53s6m.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/place_value_disks_subtraction.pdfIn PDF document text
    • http://inmyshtangen.xyz/jexoripupwo4cc.pdfIn PDF document text
    • http://ca-manalapan.space/8086_microprocessor_instruction_set_pptx0neo.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/4514885196.pdfIn PDF document text
    • http://blog-millionaire.buzz/28105832340cfsyk.pdfIn PDF document text
    • http://wajofima.mywebcommunity.org/47917633041.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392664/normal_5fcae9b61434e.pdfIn PDF document text
    • http://kuwawaf.mypressonline.com/10358475783.pdfIn PDF document text
    • http://com-servers.online/dunesubemorunirowalurac7fnz.pdfIn PDF document text
    • http://natikolom.site/epson_v700_vs_v800_comparisonryu69.pdfIn PDF document text
    • http://xelibirujegid.mywebcommunity.org/xewixasixumozixedak.pdfIn PDF document text
    • http://zebozewazogaso.scienceontheweb.net/kaxititev.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/94468796378.pdfIn PDF document text
    • http://lipenav.mypressonline.com/porque_el_amor_de_mi_alma_solito_me_dejo_letra.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapufojutujat.atwebpages.com/present_simple_vs_present_continuous_exercises_test.pdfIn PDF document text
    • http://pekowob.onlinewebshop.net/57889412514.pdfIn PDF document text
    • http://sagoralezerelo.onlinewebshop.net/99604967373.pdfIn PDF document text
    • http://kalasoziluxolim.myartsonline.com/18149848471.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_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 4988 bytes
SHA-256: 9606cf2b167c61025e222eab124cf9122467a6e1e3db74475af7317a8280ea76
font_01_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 10980 bytes
SHA-256: f8a1addcf27634b97df28c1e3a95507d1c3209d0a8028557e62add00c3d802b7

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