Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8346f7ef99cd67…

MALICIOUS

PDF

76.8 KB Created: 2020-12-24 23:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6c9c2b2f43ea34743d59428d6a46e72a SHA-1: 165144983f94d459f8a08cd00bbbab17cbb66d64 SHA-256: da8346f7ef99cd6758e152cdb52248e690b0d80788f57730dbe656bd78a610af
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One prominent URL, 'https://traffnew.ru/strik?utm_term=ludo+classic+ios+download', appears to be the primary lure, masquerading as a download for 'Ludo classic ios download'. No scripts were extracted, but the PDF structure and extensive link farm are indicative of a phishing campaign.

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://traffnew.ru/strik?utm_term=ludo+classic+ios+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374522/normal_5f979b29d34d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_5fb29f59144c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f8a07eb11e1d.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/1785666.pdfIn PDF document text
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/vuwuvodex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497353/normal_5fdc9e704584a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_5fa9d7a22e5be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5fbf4d6f98707.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/65c622.pdfIn PDF document text
    • https://lopufofogepuxal.weebly.com/uploads/1/3/4/6/134695200/fakin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fd76c4e6e9be.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://s3.amazonaws.com/retobifulipo/savukekadul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a66f09f-3db9-4e39-98c1-03b53a67b112/94894417383.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_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 4552 bytes
SHA-256: dd98cf88299f7454cd24cf8cc58edf3a920b82677c07737a8af7f8581faf4b63
font_01_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 10920 bytes
SHA-256: 05e388724232b539d704753740c1b9a23dddb4f3dcd160c0c6fa8c41264cc0f6
font_02_sfnt_off000117ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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