Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9269e818d238761…

MALICIOUS

PDF

74.2 KB Created: 2021-03-14 23:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e7e712b0b9e6e7c895856c598a4465ae SHA-1: b1b3595a28d2753cc042787813ba59466d185a05 SHA-256: b9269e818d238761094b68cc6e42d8fc25433161138c68eaf303dc19d31d0d4d
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK'. The primary malicious URL identified is 'https://gimoguvi.ru/strik?utm_term=my+computer+ip+mac', which is likely used for phishing or to redirect to a malware download. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://gimoguvi.ru/strik?utm_term=my+computer+ip+mac PDF link annotation
    • https://sifavebizibi.weebly.com/uploads/1/3/4/0/134040704/e3bfb37e19.pdfIn PDF document text
    • https://tikodukika.weebly.com/uploads/1/3/0/7/130776738/xomutubija.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366627/normal_6007bb9ac4a46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482849/normal_602878e59a025.pdfIn PDF document text
    • https://xesamubi.weebly.com/uploads/1/3/4/0/134095888/lubeduzima.pdfIn PDF document text
    • http://vaxuserinux.22web.org/kabir_singh_bekhayali_song_video.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/jowutoneranemuk/7428332270.pdfIn PDF document text
    • http://gizenelik.rf.gd/brochure_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/45876175854.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/83823290871.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/maribapaxabimep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4158347b-6017-474a-bf45-331d5d5c63a9/xidemanozupexite.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/24351055939.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/bluestacks_android_emulator_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd556fdc-c5b7-4145-bd22-8b5e32295ae8/nabixegi.pdfIn PDF document text
    • http://gigapexolazet.rf.gd/subdivision_meaning_in_tamil.pdfIn PDF document text
    • http://dagewokoxigu.rf.gd/licence_informatique_alternance_paris.pdfIn PDF document text
    • http://tugojolowok.epizy.com/govefujezefimokubu.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/weather_report_for_cripple_creek_colorado.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 4976 bytes
SHA-256: 116510e0763464e0081d575e41ceb33bcffc1363d0d1be1eab458c4a59e8b346
font_01_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 10460 bytes
SHA-256: 8c27a882a6b348bcc142e120fdc0a18d8a2da21a17aece16d372444029f75310

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