Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e97d8d0df92708…

MALICIOUS

PDF

72.7 KB Created: 2020-12-31 10:56:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ef8bfaf83d08c629529e1657c15d9aaa SHA-1: 571f2df5ef1a61278edfff23b847de8409dec5b1 SHA-256: a7e97d8d0df92708e0827a1b791a12861af04c7ef6c543f51dc32b7420529fc8
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 0.9997

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://trafftec.ru/strik?utm_term=time+flow+chart+excel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463543/normal_5fdf519925a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460706/normal_5fb286e53d4a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458837/normal_5fbf238138856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f9193df1d818.pdfIn PDF document text
    • https://jubiporosevuzu.weebly.com/uploads/1/3/2/6/132695682/5334362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_5fb53b12e0122.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/f9d6791f-18f2-433c-b59e-c99172f1dd86/jane_eyre_romantic_and_gothic_elements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aeebc10-dbfd-45e3-9eca-177fbef708b2/tudirelinajuviz.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/d_d_5e_character_build_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/98757451715.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/cervicogenic_vertigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba72b93-5953-4474-83fe-6b2464d13329/suxuxenisilulurewuxab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24caa6a2-a918-4bd4-ae18-3420c1eed5b1/dd_city_encounters.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 8

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_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 5052 bytes
SHA-256: 253b27b9a5a42e5c3f99207d2ef20b676798abdc7ec12afdfc85a8e414e4acff
font_01_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 9996 bytes
SHA-256: 7be4922d4cf0cec6da4567a64bcc4835284a5abcd8a8052158111124a4c1b28e

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