Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4c1cb612c2df19…

MALICIOUS

PDF

95.9 KB Created: 2021-04-08 02:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff14c9a3853eab86fba54086a1e6b808 SHA-1: 194f273c170dc3c68446db991feb79ea0b0e4b1c SHA-256: 1a4c1cb612c2df190a5074b02d20bcce18f2a5c08c1f847b65b4dea1a3aa100e
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 0.9992

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://jumiwimov.ru/strik?utm_term=is+kindle+touch+still+supported PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369502/normal_5fe3c431216ae.pdfIn PDF document text
    • https://jiwumakot.weebly.com/uploads/1/3/4/2/134235931/a6ef5.pdfIn PDF document text
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/4469302.pdfIn PDF document text
    • https://nutapezuzuf.weebly.com/uploads/1/3/0/9/130969421/9356956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_603af0689bcf0.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/suwagu-fejaxux.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/68115127943.pdfIn PDF document text
    • https://zonujonuwug.weebly.com/uploads/1/3/4/3/134309714/vomokadaxuzora_matexuwikafidu_fomigoxagiv.pdfIn PDF document text
    • http://vivubowi.getenjoyment.net/tuwowarav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_6015b97159808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_6058fb1b4d4a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_6032aacee7dfa.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/cancer_information.pdfIn PDF document text
    • http://segway-wheelchair.ru/muzikiwigamujutuwejupihap0.pdfIn PDF document text
    • http://pipvip.ru/wowabinovitidonufajovokmf1.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/14284047910.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lupebesu/complicated_calculus_problems_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/678f25e7-ae9e-4ad7-9428-ef302d8f75b6/what_is_the_degeneracy_of_the_n5_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d376fde-95b8-4134-86a7-51b0cbde584d/95279957313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/540d62f1-8679-4dc0-b518-c13e99759d4b/totixukufuferafoja.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/draw_venn_diagram_online_free.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F8 4832 bytes
SHA-256: f22a474c8858062e7f0375907d9776c71e54d904ed07eef39148099cc2480a8e
font_01_sfnt_off00012752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 11608 bytes
SHA-256: 43afdcb9ce1485e15b41c12df09d9d4004d271687ae9a946e9a1a57a46ac1fca
font_02_sfnt_off00014f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F23 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833
font_03_sfnt_off000163b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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