Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfd75258858aae7…

MALICIOUS

PDF

50.6 KB Created: 2020-11-25 05:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 43c72ffc5cb2cae905962690ddaf4d97 SHA-1: 9f4ea9bb0226735d8aed2707d7d34be36be0464c SHA-256: dcfd75258858aae7c5026dfdf9174702cc3e505e0a368c74d5be51beba1ad563
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, with one identified as malicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious redirects. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7009

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/aws?utm_term=custody+officer+assistant+interview+questions+and+answers PDF link annotation
    • https://wozagadukuwa.weebly.com/uploads/1/3/4/4/134483903/3c5b66.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/3764764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464303/normal_5faeef7077b46.pdfIn PDF document text
    • https://nubipejima.weebly.com/uploads/1/3/4/4/134480583/balujofa.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/7046433.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xizaxamuxive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97264896-6499-45d9-b0b1-f61d46e1a520/grossmont_class_schedule_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/potevip/roblox_codes_for_robux_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12bd6203-d094-44c4-aba8-d4aa42b112b8/38123116162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f336f1-be42-4c47-9a4d-a594f00b3d10/how_to_save_a_visio_file_as_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea226cd-040b-4b1c-b686-4fd2a22d4857/gta_world_server_ip.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/stock_investing_for_dummies_7th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6913f475-a7b5-4675-9cc2-d179a84d11bd/darkness_at_noon.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/mulekivawig.pdfIn PDF document text

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