Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fac5b0b0913fce4…

MALICIOUS

PDF

74.6 KB Created: 2021-01-06 08:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1774506dff5852d3f778fe3a8732f949 SHA-1: e8fc09874aa86d31d75d6991525791e73a7eb8a5 SHA-256: 5fac5b0b0913fce4d864fd59aa713d416385c176bdf55987e448751e37745bbc
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites, indicating a link farm or redirector strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://traffmen.ru/aws?utm_term=raju+bhai+songs+free++telugu In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5fdb39504bc0e.pdfIn PDF document text
    • https://mixudepira.weebly.com/uploads/1/3/4/3/134379104/rutinujelezofim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5fc201d0762c4.pdfIn PDF document text
    • https://nasiposeki.weebly.com/uploads/1/3/4/7/134709897/95be6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_5fd1b65028a10.pdfIn PDF document text
    • http:///\/www.lyricsintelugu.com\/2010\/10\/evvare-nuvvu-song-lyrics-raju-In 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/fcbefb9e-d559-41f8-89d4-cca9cbd02b7e/fimurapusafemewuzin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f2134f-b25a-450d-acc8-57bc8d06a6b8/rubosubefezexovobobajet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bcd032b-ef35-4130-a840-1b4b0825610b/lenovo_flex_15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00acca68-c38d-4476-a149-2d4e86255cea/buenas_practicas_de_documentacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b1007d-2c68-4ef2-a6d8-b7a17156e764/allegiant_stadium_seating_chart_with_seat_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25268866-65f8-45e7-aecd-c1de660578fb/sezozadeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467e4232-b8d0-47a3-a709-65d701b0c7fb/noxinowigekev.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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 5252 bytes
SHA-256: a8d59d65d3c012485e07ad6e6965f2305a0f1f96dfaecefed4c75495453b0e28
font_01_sfnt_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 11388 bytes
SHA-256: e90f6a4ce278779e242249c57ea5ac2f6a9741da69a1627562ca26ba37d73740

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