Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7a5aa70f3906ce…

MALICIOUS

PDF

76.3 KB Created: 2020-11-22 01:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 260b988bd1a1e7ce0436499a0550a07b SHA-1: 1d13b6f70398fdca2b696927f94146f9ef9a1fcd SHA-256: ca7a5aa70f3906cee2f9f77a909af00b2c53ed2b0843aae8179228aec33b1f0e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic indicating it is a link farm and is flagged by ML and ClamAV as malicious. The document body, though heavily obfuscated, contains text related to 'best buy surround sound installation' and an external URI pointing to a URL that appears to be part of a phishing or malicious campaign. The presence of PDF_SEO_LINK_FARM suggests an attempt to generate traffic or distribute malicious content through a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=best+buy+surround+sound+installation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f8c4b483fcd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_5fabab9b8888f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f874ce6d78f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5f92dc0253bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_5f909f00bcc30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5f89134aceab2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_5f98a7056b400.pdfIn PDF document text
    • https://jodobape.weebly.com/uploads/1/3/4/3/134317169/duwiwive_bipasuko.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://uploads.strikinglycdn.com/files/fd73e7ed-98da-41e6-858d-475d13aab1c2/dgs_deneme_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/28857233920.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/big_bang_theory_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/bailey_and_love_latest_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/verduras_y_hortalizas.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/directions_miramar_to_fort_lauderdale_airport.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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 4992 bytes
SHA-256: 292acf5a40db7fe4af5e0659e08acf326a046bf3b58d6b138165fdbeca4791ce
font_01_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 11748 bytes
SHA-256: 53d021f0cf69f0a76eb9c8b1e714270861baafcb4396de0d0ba426ad817ee78c
font_02_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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