Malicious PDF — malware analysis report

Static analysis result for SHA-256 614b334d8a336f6c…

MALICIOUS

PDF

68.0 KB Created: 2020-11-10 10:13:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 38b51d3129052b1a6cd8cfffa11bb56e SHA-1: 81700c14c8025b576f027157468aa012d713ae86 SHA-256: 614b334d8a336f6c6c46907159fac111db1969ac7f7e81b68ad6f1874ed3e66b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link and a link farm. The embedded URLs, such as https://cctraff.ru/strik?keyword=a+speakers+guidebook+7th+edition+pdf+free, likely lead to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/strik?keyword=a+speakers+guidebook+7th+edition+pdf+free In PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/b1563394f57e98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_5f95906120e07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5f9897f618a55.pdfIn PDF document text
    • https://sejejuno.weebly.com/uploads/1/3/4/4/134447194/c5086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_5fa8bb83bd3d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408589/normal_5f9b939a59d1f.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/wuzububixumuwazibude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472783/normal_5fa68290ad0fb.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/pazovugal/setizanavosolijedavidifu.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/cloud_of_daggers_area.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/decreasing_file_size_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65452949-776d-49a5-96b4-ed91d1009289/uf_calendar_2019_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a10704ae-0b29-4676-b95e-140e3fcace52/94783288100.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC244 2828 bytes
SHA-256: 2f32373152b86590eb5c993bf8dbb57d20fc33770b92bc1ec6b5fd985d660553
font_01_sfnt_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 5544 bytes
SHA-256: d36d9ea6ee0d941fde7d6792621681f6180dcf647c3215c0b1d6ae1f490d3dbe
font_02_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 10452 bytes
SHA-256: b4bb5e6fa130305c51da8af7655fdd2baf084092fcb67da2eac7044702ec64e5

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