Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff6c4fbedc135f5…

MALICIOUS

PDF

78.8 KB Created: 2020-12-19 23:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0df38b053bf46723d0b5fbc393f37edc SHA-1: 07bd9780681c9d576090a48d812b65753229727a SHA-256: 7ff6c4fbedc135f5a296a265ad34d56a5c10e2c339b2526a111e404cd2cc369a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

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
  • 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
  • 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://traffset.ru/strik?utm_term=shishunki+bitter+change+webcomic+ending PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468837/normal_5fb65baf91d38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5fb489b8dfc5d.pdfIn PDF document text
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/megagi.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/2434255.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/32d02fda75fa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500904/normal_5fc07721d4b21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_5fdbc66c199d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f88fe49de967.pdfIn PDF document text
    • https://tadazumagitose.weebly.com/uploads/1/3/3/9/133987040/gofot.pdfIn PDF document text
    • https://dotobepe.weebly.com/uploads/1/3/4/6/134680180/jufotuwowiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_5fa7199b3c122.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0f4078787e879896c419e/t/5fc2293d3c6ccf69f3a6d10a/1606560061979/cse_6140_gatech.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/freefall_worksheet_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc16e55e9fc3622d525ddac/t/5fcad3cf6e74d26c6ff21d3c/1607128016458/9851378914.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_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 10700 bytes
SHA-256: 2cfdc4af879d9117139dffd6806bb4975c98abb10f7f79cd998202c5c83af059
font_01_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 5720 bytes
SHA-256: e8d0a9e3597b565d46cda6b62e08fd3a4539d2c362ba89ca4959b1e0b3dc8027
font_02_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 10388 bytes
SHA-256: 3f7b9245a3dd54ba4aa04aeb6919655d1c09ca09b65dfc96e169ce2e73937efe

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