Malicious PDF — malware analysis report

Static analysis result for SHA-256 defc264b89d9e1f2…

MALICIOUS

PDF

78.4 KB Created: 2021-04-21 14:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9cd80d99c810264c82f7f65ca6e9201c SHA-1: c7570fd367ea3b4eff1ebe8854b2b143fb938e2b SHA-256: defc264b89d9e1f284d0d1247ecf8ad0b631f01d8c6f200fed29add3d165ee44
196 Risk Score

Malware Insights

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

This PDF document contains numerous external links, including one pointing to a redirector URL that appears to be part of a link farm designed to improve search engine rankings. The primary malicious URL identified is https://gimoguvi.ru/strik?utm_term=excel+vba+select+multiple+rows+in+table, which is likely used to distribute further malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=excel+vba+select+multiple+rows+in+table PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498882/normal_603a85bfa949d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_605d9db2583fb.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/16365499706.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fcdc292efb0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_602e2000160bb.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/jixapuzesawakun.pdfIn PDF document text
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/jemerukesivo-lapiwowixaf.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/2948055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_602f7977abbae.pdfIn PDF document text
    • https://minoximamus.weebly.com/uploads/1/3/1/4/131437876/785318.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/63977908304.pdfIn PDF document text
    • https://nofuzibid.weebly.com/uploads/1/3/1/4/131453406/0a310c.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/poguvelefa/95655817398.pdfIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_983943577fa54c41b1a4f9dc87e59559.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_584b79aefa3f41f2b6de9248eb714907.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limewub/honeywell_barcode_scanner_manual_1900.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/dijonoxodovezosekasini.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/devojonomuvogazomisu.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_2137b88daa0d4a56ae1234d316975009.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/40794595753.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/67797394341.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_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 5396 bytes
SHA-256: 22406f3975a146d8aff18cbb42b161c8b4de428338a69418310ce0c2970d3f56
font_01_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 11064 bytes
SHA-256: 0e41977052c6b71658375ba14285c08b2c9e868277d714639b80eff5e3a30e3b