Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2c457fb2cd8ed6…

MALICIOUS

PDF

89.4 KB Created: 2021-05-25 04:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d3533069bdf9fb2d8c43420dfde6d008 SHA-1: c56a12e4d1a858319f844eade883fd62e56ac8bb SHA-256: cf2c457fb2cd8ed6ba8b12d996e34fb7182e126352a684bc98fa407070d56d05
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for an SEO redirector link, indicating a phishing lure. The embedded URL, https://xezojetit.ru/strik?utm_term=cuantas+calorias+tiene+una+cuchara+de+crema+de+mani, is flagged as suspicious and likely leads to a malicious site. ML and ClamAV detections confirm the malicious nature of the PDF, classifying it as a phishing trojan.

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
  • 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://xezojetit.ru/strik?utm_term=cuantas+calorias+tiene+una+cuchara+de+crema+de+mani PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460071/normal_6010a140a8cde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_6002faeb32c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_601ed8711768f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_60196500e096b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_6023bd7bc1868.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424630/normal_5fed6c15340b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_6064fab2aba17.pdfIn 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/d02411ab-b786-4729-af99-70e9f57b9adc/18116017783.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/honda_marine_dealers_perth.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/formato_check_list_de_vehiculos.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/jejefugij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5148d1-3161-43d3-9c0b-71c64e35fe05/vunofufibepobalita.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/66906778448.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/go_tell_it_on_the_mountain_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/62794840394.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/fsdax_fund_fact_sheet.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_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 5084 bytes
SHA-256: c8f2b6b64671ac9b237c75af777082cb8659050da2e0e2e48ee8d8922c3d73b9
font_01_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 12724 bytes
SHA-256: 319167b13356b3444811b1cf34892f89dda9d5ba15b51922c57d920fc30ca390