Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f2a1fe58d6529b…

MALICIOUS

PDF

67.1 KB Created: 2020-12-26 21:27:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e87d3789c1f89fae4a645a2885b5686f SHA-1: bbfc05f47eb48567945109c2ed44b2a68086cbba SHA-256: 77f2a1fe58d6529be54ff2176617879307f5cb603e6871cdba4a6723eeaeba3e
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 0.9998

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://trafffe.ru/strik?utm_term=vista+valencia+golf+course+jobs PDF link annotation
    • https://cdn.sqhk.co/mivesumor/fjasif0/clouds_film_2020_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/TPmEr5F/suvuxesiwabi.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/fipatu.pdfIn PDF document text
    • https://cdn.sqhk.co/liwewajawab/igidJMN/7650890001.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/denesanijibep.pdfIn PDF document text
    • https://cdn.sqhk.co/guzunilepin/ij0vRbG/history_great_battles_medieval_pc.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/3ef29.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/TxfjgF0/missing_persons_rate_by_state.pdfIn PDF document text
    • https://cdn.sqhk.co/munemuzabuk/gie4hej/46001545574.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/gfa53Nk/music_downloader_skull_mp3_free_download.pdfIn PDF document text
    • https://vanoxurele.weebly.com/uploads/1/3/1/6/131606202/9417342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab69c20-c27c-48d0-98a4-a54eba89049c/mupipipeti.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/mastering_astronomy_lab_2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31f99de-91fb-4cb5-83bd-61caa9dda17a/24129903671.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/fever_tree_band_wiki.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_off0000c9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 5292 bytes
SHA-256: 12691f7d3ffcbef238184bdba78b91b862e8080faf674cf2ceee07284633aaf0
font_01_sfnt_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 10208 bytes
SHA-256: 47b8b58d8913e8d2acc6c94e30f51d5c865dc3bffebd1ed82b1ed11d567a4591

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