Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a1fd8c9cb538cf…

MALICIOUS

PDF

46.5 KB Created: 2020-11-05 18:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7c722336eeacee70a7e6ce0e97d4718b SHA-1: 533a53cc56683523532a68192341181e2a80d3ad SHA-256: 15a1fd8c9cb538cfe70e0eabb73fb4ad2147a082500dfc1896baeb78b37a11a3
96 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 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 1.0000

Heuristics 4

  • 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://traffnew.ru/strik?keyword=why+the+rich+are+getting+richer+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5f8e2abeb7a49.pdfIn PDF document text
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/merujugazudi.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/6582921.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/balibusoxuriduze.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/wonoti/4980351660.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/xobaduf.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/trolling_motor_troubleshooting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/jajuwonasemeguleziruk.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/anteaters_guide_to_writing_and_rhetoric_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/dokkan_battle_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bikebuduvud/gogilafatapizosuv.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/how_to_speak_english_fluently_in_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/lumeziwebogutasuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/bcbsil_provider_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/what_is_a_fund_balance_report.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_off00006926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6926 5000 bytes
SHA-256: 3a2a802e809e11e0261a6f2f22d0c6bf910e401a7994132e5b0a6259ea2d3616
font_01_sfnt_off00007a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2C 10728 bytes
SHA-256: 294a716e439af95386b3ea795c9227880ef099fd5fd0b997c0e830f21ef25544
font_02_sfnt_off00009ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EBF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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