Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3f9b23ccaf87e0…

MALICIOUS

PDF

105.2 KB Created: 2020-12-17 17:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1439b6e660700366d24e3820a192deb2 SHA-1: b64668f97597eb55396ba45cdfdeec9fea0be5d0 SHA-256: ca3f9b23ccaf87e0bd6991d595bb5bc381a20b11c631a17f7be0ee26a6bd5a23
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to redirector infrastructure, specifically 'traffking.ru', which is flagged as malicious. The presence of numerous external PDF links, including one pointing to 's3.amazonaws.com/rujabepifar/7042085624.pdf', suggests an attempt to obscure the final malicious destination or engage in link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/aws?utm_term=fabaceae+family+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5fca2bb845562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_5fbcb11774b47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5fae9b4c1eced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445737/normal_5fbc91edeead2.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/putamukeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_5faa6aac73c6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5fd2e0337c43a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5fd3cd798123a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461761/normal_5fa7a9aa9ae2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454179/normal_5fc890de23577.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/rujabepifar/7042085624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58adbdda-ff4f-4ceb-9273-a6c15128e115/vojus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48bf01f-7a64-4104-9ead-c25ae50409fb/10476013786.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_off000151ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EE 5224 bytes
SHA-256: 6ceda3d2d59a66e4d379d9fcf988a66970da8143a4bcc2498a90bb16ef3780ba
font_01_sfnt_off000163ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163AB 1716 bytes
SHA-256: b744d20329a21ba1921c870a4deaacb4064f710d75eb1a58e31c0067c31195cd
font_02_sfnt_off00016c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C51 13956 bytes
SHA-256: 53654733f6b1af4e8836a523badfbb0e758b80fac02c37a71bba35b2aae6bb79

Open this report in the interactive analyzer, or submit your own file for analysis.