Malicious PDF — malware analysis report

Static analysis result for SHA-256 3567f1b06e7d6630…

MALICIOUS

PDF

77.9 KB Created: 2021-03-26 04:13:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 55513409816ed88fded135a11df8c891 SHA-1: aed6c8fd6cca53f25bca38b2d3c1eb3e06d0950c SHA-256: 3567f1b06e7d6630620ff3dde29073615c61eb4ade0a851d35ffacf68a5c8d77
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm designed to improve search engine rankings, as flagged by the PDF_SEO_LINK_FARM heuristic. One of these links, https://golowaki.ru/strik?utm_term=new+monster+ducati+2021, is presented as a lure related to a "New monster ducati 2021". The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/strik?utm_term=new+monster+ducati+2021 PDF link annotation
    • https://molisepav.weebly.com/uploads/1/3/5/3/135347716/rudowodujenoji-gumixo-mabetugujises-gavederejobot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495040/normal_6025720040502.pdfIn PDF document text
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/putolegupomikugew.pdfIn PDF document text
    • https://rimokukesezawuk.weebly.com/uploads/1/3/1/4/131437069/4819878.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393637/normal_6002f4ec340e4.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/baeb119e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_602c837945a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_603bb61280326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450516/normal_5fdfc4720adf0.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/rakabexozu/jijesegisojibomitajif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4771be63-2606-40d8-9825-773dfc0577ee/torijatawu.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/72074628106.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/tuwuxozajije.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/format_number_in_oracle_sql_developer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c2fd5d-9b1f-4b1f-9ee7-a598cf90b4ac/is_boston_market_food_healthy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326a0dd6-8243-4d82-99ff-41a4dce7751e/blade_180_cfx_servo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/145b329d-f0f5-4d24-8abe-4e582e43c169/how_many_cubic_feet_is_the_kenmore_800_washer.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_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 5440 bytes
SHA-256: 1386f8e1d27e24a5fbe155d4a8ea66a8400f6a94c0dae7003b8ddbcdfc28de2f
font_01_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 10672 bytes
SHA-256: d8ba9c8a8cfe53979b2eb31f496703d4a4916534067d553f731b060d5abe790d

Open this report in the interactive analyzer, or submit your own file for analysis.