Malicious PDF — malware analysis report

Static analysis result for SHA-256 893d598d328d7d28…

MALICIOUS

PDF

69.0 KB Created: 2021-03-25 17:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eb3a0fc7478d553df34dae0ac2086661 SHA-1: b1f17761934c97f22112bab3da8f06a075d44099 SHA-256: 893d598d328d7d280640068a83426547fd3d2b65944f08062a18e4d4d2a16bd6
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF documents hosted on various domains. The heuristic firings indicate this is a link farm, likely for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt.

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://yafferge.ru/award?keyword=canvas+lms+tutorial+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_6030ab29b4e13.pdfIn PDF document text
    • https://wifonofiwi.weebly.com/uploads/1/3/4/6/134636358/bugakinexabimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_601788e552ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482215/normal_605c0000bf880.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367273/normal_5ff4d847363c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468828/normal_60161a7b98977.pdfIn PDF document text
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/2b63f2a0ebc096.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d263290-6c73-47f5-beb3-0d721bfed3b4/1214706972.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/wototodejotowa.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/romantic_birthday_wishes_for_wife_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb42512-841c-477f-bce4-33a6682ea34f/cessna_150_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/15697268621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2593c253-fff2-4620-aff9-83d38fc63627/24656706278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a3ca15-e916-4a71-8054-ba5cda67172b/jigatewisixeb.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/bizalaxunakevuzog.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_1b00434b6ec34af4889139109cad3d90.pdf?index=trueIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_9767d92edde24537b5412253234d0c7d.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_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 5152 bytes
SHA-256: c1ef73c5cc898801689f9c249031dd265d4989032b61b6028e9c11ed08bfac17
font_01_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 11144 bytes
SHA-256: 6286f4fc56c953d207a7d0240fb9dd749790012eacbae339e8168f9db8816792

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