Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f62d31104a320f…

MALICIOUS

PDF

71.1 KB Created: 2021-04-01 03:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 63c687c4e46eddbe723c7f18747ab0ea SHA-1: 2a40fcc8b85aa64615c04bea4c34e36e9cbe2769 SHA-256: 21f62d31104a320f6917d62903a07c2e7278885b1389bd349152d63327ef2b12
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/award?keyword=syntactic+theory+geoffrey+poole+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410415/normal_60023d52bf223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470024/normal_6051f2a2635d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478952/normal_5ff7ee9744d1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393511/normal_5ffce18abc9ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490367/normal_5ff1cb5f28e1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_6045083adb1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_6032a6305d67e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_600c4440dfa70.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/pafiganovavi/wumososiroxu.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/romeo_and_juliet_act_1_scene_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f1b90ce-97be-40d1-8497-6341c83eafda/dividing_fractions_by_whole_numbers_worksheet_year_6.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/16456063417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828cc139-535d-4cf2-ae93-5ca12473ca4a/post_office_account_number_digits.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/40860094995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a18d3f-aeb8-4595-8bcc-a33333022620/1602183875.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/teliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08420be-bd73-4416-9a1e-185c6f27bcd2/24277544089.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_d73a1b5b44c74923bd76d3b9b956e31d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/schwinn_airdyne_ad4_upright_exercise_bike.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_0dfa7bc45b01497d935db70b7d892d3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/titugome/how_to_turn_off_alarm_on_casio_watch_la670w.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 5444 bytes
SHA-256: a5a1b88f0d2f5b936aae283c5b9aeb7b06d90aa92a5b3cfaa067de3170d236eb
font_01_sfnt_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 10724 bytes
SHA-256: 92e9c8a04b093eeb1f532958df0da0b4c22a5c94d74cc6e36c38f776f0c31cbd

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