Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7836c55cb75712…

MALICIOUS

PDF

78.2 KB Created: 2021-04-17 07:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1f54f29ba3226615b447fc345745e3a2 SHA-1: db4fa436e7b792a808e099dfb3923eb507ad06f5 SHA-256: 1a7836c55cb7571285ad7033256754f74154fef1403608fd77d0bae5bf3628aa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. It contains multiple embedded URLs, with a primary focus on directing users to `https://golowaki.ru/strik?utm_term=theory+test+price+uk+2019`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` suggests the PDF is designed to host numerous links on disposable domains, further supporting a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=theory+test+price+uk+2019 PDF link annotation
    • https://cdn.sqhk.co/wosipuvetot/ghV19hd/gilamafatomujubatit.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/gciihdD/hey_clay_dinosaurs.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/hniighM/hideaway_pizza_edmond.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/82235154215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_6029b094aeac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_604e7c07a9251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_606c90c4cab18.pdfIn PDF document text
    • http://tronreserve.online/genie_intellig_1000_reset_keypad_programmingwwvpc.pdfIn PDF document text
    • http://teksol.xyz/po455_dodge_durango_2007kn4k9.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/maserati_granturismo_mc_sportline.pdfIn PDF document text
    • http://xelibirujegid.mywebcommunity.org/how_to_set_sharp_atomic_clock_spc932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470224/normal_5fec20da71e68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420019/normal_5fff7746c02a0.pdfIn PDF document text
    • http://govnosiakxws.online/jquery_ajax_dropdown_example_in_phpvwpae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_1b71bacba2e241eda5ccb1484351cc82.pdf?index=trueIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_cec6662a04904488b2076d191d5e3195.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_f27a3665db514a1e927783b48ba53f63.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_20aae6942efd4109855b58c84ebf02b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c92067-4823-45f1-9e0e-94ca6946731c/vaxukixovabokezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1c4fca-187c-4475-81fb-df8ad78c0df1/17025518388.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/10655844464.pdfIn PDF document text
    • http://pulitisagot.atwebpages.com/sunday_school_attendance_chart.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_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 5376 bytes
SHA-256: 32c69da4bb82fe9f8fa79c6a70d85b4b97cb7c81a4b15e357c55745a262ba1c8
font_01_sfnt_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 10984 bytes
SHA-256: 3895a4a98d6018837f12875ce2d8dd8f3e50579ee87e38155dce15349aac77d9

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