Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d45525e2c20b625…

MALICIOUS

PDF

66.9 KB Created: 2020-12-19 17:30:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 722f572af09b472cf543f4c118c2f947 SHA-1: 93a3bd56eeba3b0c33bdf0a6323d21d3ae1de8ae SHA-256: 8d45525e2c20b625b55526312ab9738356da903496dc5fa56432daeabb34afd2
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many pointing to disposable hosting or redirector services, indicating a link farm designed to distribute malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or phishing.

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://gettraff.ru/aws?utm_term=business+proposal+format+email In PDF document text
    • https://nazivuwe.weebly.com/uploads/1/3/4/4/134452961/6671428.pdfIn PDF document text
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/3a4d6537f136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_5fc4712da884e.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kovolobox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f884c5a9bbc6.pdfIn PDF document text
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/kelalategiluv.pdfIn PDF document text
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/6198737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5fda9270ac621.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/7b6521ef0d0.pdfIn PDF document text
    • https://nujuwededewomoj.weebly.com/uploads/1/3/4/3/134305400/7956644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456671/normal_5fa2364e1b061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc2b498e9fc3622d52dc1d8/t/5fc3c5714e98326c02846d1a/1606665586330/mokotexikavowonujinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52132127-15d4-445d-b401-281080179fee/milatuwurakis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d66cf0-4621-42d4-a501-658b881368e5/53590756639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8ff8e3-6a4e-4e51-b38f-725d8fe9f207/larry_fuchs_painting_st_louis_mo.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_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 5096 bytes
SHA-256: b53411e7be09e44e6e0cd22da619bef6731c234077577f9ec2fb31d928bcb1f8
font_01_sfnt_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 10152 bytes
SHA-256: c61afa3c6469d22c49eb887806bd63306707ec79ee96d457318aa4af6e33dc76

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