Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c68412fa589793…

MALICIOUS

PDF

71.4 KB Created: 2021-01-11 12:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6ec673939fa68958e65be91376b205ed SHA-1: 69a7d25b4126f4945d4ef29c5215e3e8e4994186 SHA-256: d5c68412fa5897932ac3194c68ccede1b5da8c18c6062ddb850672891bd80a9a
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The presence of a redirector URL suggests an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/aws?utm_term=artemide+teti+pdf In PDF document text
    • https://napepoxamugif.weebly.com/uploads/1/3/3/9/133997580/muxulefo.pdfIn PDF document text
    • https://dubekanenek.weebly.com/uploads/1/3/3/9/133997540/biwebigiran_dusewiki_pufajumudowo.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/rjcjSfK/crazy_zombies_9.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/z2igZ7A/gubazajobonifa.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/1f3725e15044.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5ff84d3fb3556.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392451/normal_5fdcf5bb6c938.pdfIn PDF document text
    • https://tipuxefisabe.weebly.com/uploads/1/3/4/8/134846761/zomije-xawofuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422627/normal_5fe836a3a9fa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_5fa4c342610f4.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/7421535.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
    • 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_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 4328 bytes
SHA-256: 8ca79fba4ff296e98df7209ec2d8dfb0b70fad2cf033ccf9c376dff1dbdf5798
font_01_sfnt_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 12564 bytes
SHA-256: 5acbcfb7834c2ee38a2b7b355b3f36108c4c1e7cbb5837b3744ca721646dc9e4
font_02_sfnt_off000101f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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