Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a54bde1bfa897a…

MALICIOUS

PDF

75.4 KB Created: 2021-05-27 08:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: de42743dfb7c92671c0de6d5f0d0b505 SHA-1: 11f2a378854e916560ea1748f30c01e99072b7cd SHA-256: e2a54bde1bfa897a1f53ff4401db66f9c24e1729db52429c7c598e68c6ecc812
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 0.9999

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://maypoin.ru/strik?utm_term=roman+adventures+britons+season+1+caches+level+20 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390371/normal_604508a97a3d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_6067e0c02b0b7.pdfIn PDF document text
    • https://sarisiwubaj.weebly.com/uploads/1/3/0/7/130739508/zisirufexejitodip.pdfIn PDF document text
    • https://pakedarisibibo.weebly.com/uploads/1/3/4/5/134501134/vojepaxutaxeziji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474989/normal_604ff37eef60f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_605e0b4c3d780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_601d4f259328a.pdfIn PDF document text
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/raboluzubix.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/dd784c06-8a5d-413e-8bdf-7e4109ba7658/gotulalodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e39a2c-ec9c-4ae7-bb86-f5b72acb452e/29476227998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea148410-0648-4e13-b225-330f33097495/how_do_i_cook_a_spiral_ham_in_a_crock_pot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775421f8-eba6-4cbd-99b7-9560ef100e4f/39005310070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a3cd44-386f-4918-8a4c-423a5dfd1e75/indian_vegetable_dishes_for_dinner_party.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a47ec7-8c7c-4279-a018-2a867fa576fe/innova_3100j_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a7d43a7-b56c-4d18-884f-01188e438344/sazevamemojebimezatuxuwi.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_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 5712 bytes
SHA-256: 4bf515e7b1ddf8750ca64ae27b0788fa8610581747fdb0a0e2b2c42d1f3462b9
font_01_sfnt_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 11240 bytes
SHA-256: a782be681718c2757a13c7cd110a5a3022f9d9362494c0212344698d77d1bbab

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