Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b613b2f4d6b7c7…

MALICIOUS

PDF

72.8 KB Created: 2020-11-14 00:28:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: db67c881f3b1c502d0d76444150122f8 SHA-1: c7e8388c861c198df351146bdad9bfaa879061b7 SHA-256: 37b613b2f4d6b7c796184b4fb1df599a413568a3243ad726f1156d5f80cc9a22
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to SEO-optimized redirectors, indicating a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK strongly suggest this malicious intent. The primary malicious URL identified is traffnew.ru, which is likely used to redirect users to a phishing or malware distribution site. The ML classifier and ClamAV detection further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffnew.ru/123?utm_term=zero+odor+spray+vs+ozium PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5f91574eadd99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5f90faa978b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_5f93e4b0904df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5f8aa9b20190a.pdfIn PDF document text
    • https://xesilowavexaweg.weebly.com/uploads/1/3/4/2/134265648/jopotuv.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/10f88773-8cbd-4236-96bc-7f9efcd583e9/93871484992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75746f1b-5894-4018-bab5-60b8aa55bef1/88729047068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f720e47f-1a78-4cd9-bb50-2deb18677c5e/what_does_mk_mean_in_a_text_message.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f87be01-939f-426a-88a5-b627d7a27568/myers_psychology_textbook_e2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f78bab-cd64-4bce-b7b4-3a70afc31016/52947144003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f405ca-9257-4c6e-863b-d000159ae8c1/hart_of_dixie_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae52131-fb74-409f-9c86-288e0782f4da/ganifixelobuxebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7721f9-83a9-45e5-8d6e-0907bd91b5f8/zileji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93edb566-ef6c-48b9-a885-13f388526bd8/xezumonebutab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 2968 bytes
SHA-256: a3409f23d318cb64f50816b13ffa5e4cae8c31e9b9ecf1c6aab81bc325688a60
font_01_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 5240 bytes
SHA-256: e5bd6e849c7b3d623ea04e5c031ed2dd5696784c1198bebf33d32435efb210bc
font_02_sfnt_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 10380 bytes
SHA-256: 64d5ec3e8e4d44b5409f95fe0916cf6799b93c297da9c85a5d810a5450a7df22

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