Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36190fe4284947f…

MALICIOUS

PDF

67.1 KB Created: 2020-12-20 11:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a4a7827c394c64971e1022d9244fd26d SHA-1: 77d2fd30c5f6ae1c0225bf89eac5f1a76a6ac139 SHA-256: d36190fe4284947fb39afe49ead67f13ea06e8c76bdb5e6297755580ab602e74
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_UTM_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS, indicating a phishing or malicious intent. The embedded URL `https://trafffe.ru/strik?utm_term=add+horizontal+error+bars+excel` is identified as a redirector, likely leading to a malicious site. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=add+horizontal+error+bars+excel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f8c3e9a0e2e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490244/normal_5fbd832c324a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_5fd98962eef3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499299/normal_5fd8d0bbc1f6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367005/normal_5fc7df5c3372a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_5f8c9223b7898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5fbefd838307d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/msi_afterburner_free_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90cc817a-f604-4611-a833-ec5b205cf861/where_to_install_skse.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5211dec917750a3f31b0b/t/5fd6550c89566e781f4d3e95/1607881996716/facebook_icon_missing_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/story_of_seasons_bachelors_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/comp-xm_final_exam_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68429bd4-e68b-4576-b545-0d9dfcc63743/what_zone_is_ohio_for_growing.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c475c89e1c4b8fdffacc/t/5fceb4766d8d5c7d479916a9/1607382134628/teddy_bear_wallpaper_for_mobile.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_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 5276 bytes
SHA-256: d432fc7b2dfeca4f5dfc9199ed1eb39b6c6d9b9e0b59f44f4414f404925940c1
font_01_sfnt_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 10464 bytes
SHA-256: 15fe06e3e5ac145ff18b82ae6690490a0dedb2a6b44472fdf4bb0b7c31bbe5de

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