Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10cfac4a33e8682…

MALICIOUS

PDF

94.6 KB Created: 2021-03-14 04:26:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2526942a73d536ed4ce93f500b806bfa SHA-1: a94fbc92bb160261ecb407d92b9d9c8cfeec3cb8 SHA-256: b10cfac4a33e86826bbab7f075a6f9d75521a637ea9a547aa89864463a8364a2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://zajinet.ru/123?utm_term=assume+form+james+blake PDF link annotation
    • http://talkme-news.info/old_dominion_freight_bill_of_lading_formbnb7g.pdfIn PDF document text
    • http://game-pro.xyz/96807247381jg1jy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389820/normal_5ff4d5c8dd249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380707/normal_5fc69ffe70fcd.pdfIn PDF document text
    • http://zanupolema.iblogger.org/pawalunesinasokobakivona.pdfIn PDF document text
    • http://pedalini.club/solid_design_principlesamylk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450438/normal_5ff21dab515da.pdfIn PDF document text
    • https://xexafuru.weebly.com/uploads/1/3/1/0/131070851/puxogewe.pdfIn PDF document text
    • http://fishing-rods2.club/nfl_news_covidbvuba.pdfIn PDF document text
    • https://tulovituvo.weebly.com/uploads/1/3/4/2/134234708/5782970.pdfIn PDF document text
    • http://fotaper.iblogger.org/59942843538.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/lebejos/75882541561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954ac882-a3f2-4e30-88d6-b5c840ce77f3/jeux_de_carte_a_32.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/wufexejiremulerop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14064e8c-a9a6-4ad7-ba46-114ac0e6e791/lixutadoxopufazixerelagap.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/inorganic_chemistry_research_impact_factor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/599b936c-15eb-45c1-8fe7-b3fb2fac735e/23759323372.pdfIn PDF document text
    • http://fonugaxow.epizy.com/movie_sequels_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06099855-2331-4405-b160-88c0d45a7b78/5190041403.pdfIn PDF document text
    • http://xejuzilawa.rf.gd/nogizesanej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1fb5bd6-f37b-469e-807f-109c241a68b8/does_failing_a_pre_employment_dot_drug_test_go_on_your_record.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 4020 bytes
SHA-256: cdb5ee3ee27763ecdb3a4c6873ead585d15295f01115dbabaaf6fc8f5412730b
font_01_sfnt_off00012e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0C 5180 bytes
SHA-256: 74be3cc6461092524a1ca19d49185656f8190bc30d849d085c1a3b246e3f511c
font_02_sfnt_off00013f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F99 14704 bytes
SHA-256: ca6ef5ecdf2a9e6c546c7026f38e55c562d1e4d3ed5942d90183e54d53085352

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