Malicious PDF — malware analysis report

Static analysis result for SHA-256 560e41631b38244c…

MALICIOUS

PDF

80.5 KB Created: 2021-03-23 19:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bc9f565635a43159778afac90154f82d SHA-1: f0fd204e51ba626492be17d31c0a6787df30b665 SHA-256: 560e41631b38244cf16843a5ff288ef5844c8c2835d531bc4fca2184983003e2
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 contains a large number of embedded links pointing to external PDF files hosted on various disposable domains, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is used for phishing or distributing malware. The document body appears to be malformed or truncated, providing no direct user-facing content beyond metadata.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://yafferge.ru/award?keyword=antonio+caballero+historia+de+colombia+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_600f0966d8c78.pdfIn PDF document text
    • https://tujiwukof.weebly.com/uploads/1/3/4/5/134592642/db5806427610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_602d69b16ee88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5fdb324f96e9c.pdfIn PDF document text
    • https://vojawozusuv.weebly.com/uploads/1/3/1/1/131164351/a57ffa59.pdfIn PDF document text
    • https://rezolokad.weebly.com/uploads/1/3/4/7/134718373/6ce6c30e19c75.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/paxifisal-nigofejodi-bozakemeribije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_604aaa4e8ae64.pdfIn PDF document text
    • https://nowatipuzovatob.weebly.com/uploads/1/3/5/3/135397830/xunag.pdfIn PDF document text
    • https://zimemomikinipex.weebly.com/uploads/1/3/5/3/135347479/9649776.pdfIn PDF document text
    • https://widegavadiwudux.weebly.com/uploads/1/3/5/3/135325068/dufenazofetutoxokive.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/neoplasia_endocrina_multiple.pdfIn PDF document text
    • http://nukivapoj.iblogger.org/57079460559.pdfIn PDF document text
    • https://kuxaxamolexude.weebly.com/uploads/1/3/4/8/134869233/3061003.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409394/normal_5fe426c1c3274.pdfIn PDF document text
    • http://vijofogozorumi.22web.org/xilenamuvajekurudofavi.pdfIn PDF document text
    • https://tatajojaboxu.weebly.com/uploads/1/3/4/0/134040665/zejamojoka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pivirujifija.epizy.com/terudebosopezunixew.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/najisisobojaxelebaku.pdfIn PDF document text
    • http://zezatavaveb.epizy.com/6242882817.pdfIn PDF document text
    • http://titugol.atwebpages.com/59391419003.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_8271922fbb284bd88df8e4fed751ffd9.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_9d12599a1e5e45b6b6978df3f6662fa9.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_99358ae3f743480e87920c97889ca105.pdf?index=trueIn 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_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 5524 bytes
SHA-256: 555854f1ded66839dc6c05f4dbfbcd7cf6796e0c4475700aa16fe2279cec20b1
font_01_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 11792 bytes
SHA-256: 0e07c15ace33e148b0f453749d265ebae769ac17ca132aea8c94580b50c8b2c2

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