Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbfe6d0c1837ef9…

MALICIOUS

PDF

62.4 KB Created: 2020-11-25 23:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 944e74341e1df5c6a4f69fd329ed8f77 SHA-1: b1d331ae009a41e2c61883a5d6b62339419feab7 SHA-256: fdbfe6d0c1837ef98360d0122a435fd0d86289019ae92071f6bc82d8ed8925ac
214 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 file contains multiple heuristics indicating malicious redirection and a link farm, including a critical finding for a PDF redirector link. The embedded URLs and the ML classifier output strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and the presence of embedded links point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/strik?utm_term=minecraft+treehouse+map In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417129/normal_5fa2e8fa18bd3.pdfIn PDF document text
    • https://valogasode.weebly.com/uploads/1/3/4/3/134320371/suditof-morojidawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5fbaa2b777ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_5fa6d1e316643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nabifovu/zuvoneleralelepenogikel.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/lorizobivigamub.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/30437328460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54cc960b-fa97-463b-bae0-ea777190a816/42044392132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e420d148-3525-4a5f-9a7a-4ac583c4ac02/zexekisifepefeg.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/55288938952.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/94700513206.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/tv_guide_sioux_city_iowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b39f687f-ad60-42dc-b6a7-649f1c343ed1/nisekikadeponuvema.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/unix_commands_list.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_off0000b986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB986 5228 bytes
SHA-256: 384f946588d58cd596dedcb07091185e776491fb81cf25fd29967166e2ba6cbf
font_01_sfnt_off0000cb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB38 9988 bytes
SHA-256: 007b0458086a8391f9b8109372e8e1a51a28383965a6e74b05b2a5f53fb38857

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