Malicious PDF — malware analysis report

Static analysis result for SHA-256 740c1eb445665a3f…

MALICIOUS

PDF

72.8 KB Created: 2020-12-19 01:08:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fda9bc4e44d5c8e580ec2455e93a8a51 SHA-1: 477df9435ea4ab307dbf14e72a0ced885a47f882 SHA-256: 740c1eb445665a3f17d7a37ff09809739262b786f43a6e21e29a7de942ba229d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. One of the extracted URLs, 'https://traffking.ru/123?utm_term=nicknames+for+cocaine', is particularly suspicious. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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
  • 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.
  • 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://traffking.ru/123?utm_term=nicknames+for+cocaine PDF link annotation
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/9576462.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/pimaw.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/kuvaxe_wixobenidebilo_vuzodufawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380383/normal_5fbb4e2443cf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_5fd828bb7f252.pdfIn PDF document text
    • https://zuzigiwasozobe.weebly.com/uploads/1/3/4/6/134676944/wimagimo.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/nelaraj_dudivigulikifab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/30ae80a9-2bb9-4033-86db-414dd1c371f8/nijevuxesodev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b8aa9ee-7b04-40e9-806c-f54bb3d033da/xopovunivi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06b148139af037642cc0d/t/5fc10f0acb3e0f577174fb79/1606487819247/67713000498.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/guideline_dengue_hemorrhagic_fever.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68294bde-b9de-4267-bbe2-430e8568303a/wivorakelelup.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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 4736 bytes
SHA-256: 29c00567b1bd817f3eb41ba05ca3556114a484292ad55634631a861f7fc175b2
font_01_sfnt_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 9940 bytes
SHA-256: 69ab6f9401be9177bfe0c7a9c12d18549f8317ae229b68f4b24cf0f9bd532859
font_02_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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