Malicious PDF — malware analysis report

Static analysis result for SHA-256 178badb33a0c9348…

MALICIOUS

PDF

67.3 KB Created: 2020-11-25 00:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1c659730098895b86e949833dcac00c6 SHA-1: 9ca1f02041e5169b8c656fd56e5421db1f4dccf6 SHA-256: 178badb33a0c93488db04679585067b3e207cb0d387d8f2ed5665ca872aeeae3
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/aws?utm_term=lcsw+clinical+exam+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5f922b273fc99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428335/normal_5f9ce795baed8.pdfIn PDF document text
    • https://wufenimikefi.weebly.com/uploads/1/3/4/3/134366244/xeviser.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5fad13ecf018a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414860/normal_5fb4d8f1818ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_5fa6deed2e349.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/91ea66.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/3c109429-9d2a-4ab6-b2a0-c6e77feb963c/the_day_of_the_jackal_full_movie_1973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d330cb0-fdf6-45b7-abf7-bc7dd67caa45/95504584650.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/98529538192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca170bc-8baa-4b45-936d-236bafc6d761/garejaz.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/paloma_de_la_paz_origami.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/xilesukavuwapowudupokegot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01ba901-8734-4d94-a234-4ed2a38a8bef/sea_salt_ice_cream_kingdom_hearts_recipe.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_off0000c91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91E 5368 bytes
SHA-256: 319c6286ae7daca5a4c7e93bf0f7f5b13c154d140882f4cbe1230cb1a0b45e72
font_01_sfnt_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 10876 bytes
SHA-256: 188004419dd72a4b2d4e99430f2d800528cea2d1b91dfb35fd7799a3af8d2ae5

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