Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f86fb7dc2ea3ad…

MALICIOUS

PDF

68.3 KB Created: 2021-01-04 20:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 869c9d81167c4619b732f4dee6a23aae SHA-1: e7ecc8af3f39a53cc32dfe63f5a9c9c19729b046 SHA-256: 03f86fb7dc2ea3adea5fa5c81dc9bc1289c4589127313fc0ccdd36a794f1a4cb
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document is designed to lead users to malicious sites. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or redirection tool.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?utm_term=lg+wm3050cw+manual In PDF document text
    • https://jitoxegewizo.weebly.com/uploads/1/3/4/4/134460998/pegajowerudawi.pdfIn PDF document text
    • https://jodonorinomudo.weebly.com/uploads/1/3/4/3/134316483/jewajegu-tegam-ritolapebu.pdfIn PDF document text
    • https://ludugekokokak.weebly.com/uploads/1/3/5/3/135313409/koxotezoniwurefe.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/d6eb0f20e.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/05aa344e.pdfIn PDF document text
    • https://sipexagugiresu.weebly.com/uploads/1/3/4/6/134607427/segimitezesodop-warobex-lezoxamevujimi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483336/normal_5feb68f298419.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/044959e4-1df3-464f-bf27-82a98dd54179/30064655391.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/61912816819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f140f7c5-6b40-4b59-83f5-02ff9548f204/niwudobubovav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaeaa588-1235-464d-a9d8-711018bfb3d1/ragevomarewat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/670f8bab-1da9-4980-8c75-5c12779537c4/39095425637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd14017-02f9-4d7c-8720-ce02eee10cf6/jejigijurufe.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_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 5308 bytes
SHA-256: b1a9eb95af24abd8d7db7ab653dc140c951c84a99fa7e58edbea28d6acc7b0ca
font_01_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 11144 bytes
SHA-256: 3f19fa618030cf620616e4978e3b50fcd689edc07983e337d4333566eec70a19

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