Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf90a1b4bf16c02…

MALICIOUS

PDF

75.2 KB Created: 2021-01-09 13:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6bcc0d5028eced6e22232607ec1232fe SHA-1: 94da80028b8b2e5cac856102b8eb85e0a36047bd SHA-256: ebf90a1b4bf16c02231c3dfd049627c4ae0eb6ce54c94f975cbe979fe7ccedd6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDFs, a technique often used to obscure malicious destinations and evade detection. One of the embedded URLs, https://cctraff.ru/123?utm_term=red+leather+loveseat+sleeper, is flagged as a known malicious redirector. The ML classifier and ClamAV also strongly indicate maliciousness, consistent with a phishing or malware distribution campaign.

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
  • 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.
  • 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://cctraff.ru/123?utm_term=red+leather+loveseat+sleeper In PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_5faec6dbe70ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480899/normal_5feb4a6848df9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5fa81b9907013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459329/normal_5fc68f6d4bc6d.pdfIn PDF document text
    • https://xalorato.weebly.com/uploads/1/3/4/3/134317389/wamivokudijew_vamok_lidijafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417212/normal_5fcc7e22b7f31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460968/normal_5fa37701a8731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5fa839580bc7b.pdfIn PDF document text
    • https://benokonafininu.weebly.com/uploads/1/3/4/6/134606635/dejawufevabunik-meturet-jelubovenuritim-gilixutofog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459182/normal_5ff08092acd1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_5fa3ba8ada368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fda766944cad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493282/normal_5fc2f96358d65.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/30cfcc70-f53c-48b2-a49e-f496a470622d/mitsubishi_tv_repair_michigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1375932f-2227-454d-b7ef-bd6cdaf4e213/74121890150.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_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 5116 bytes
SHA-256: 8324a978ad284d96f8ec704841faf67e9cf8713a6c294f97bfd0095c712675d6
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 11456 bytes
SHA-256: 5e4f298bac80e8febb26642585af3a640d37a5040bdd5b583dca34c488b67bfe

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