Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58e502216b57d73…

MALICIOUS

PDF

119.7 KB Created: 2021-03-23 09:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5becad993be11e83dc57ee9e85b3ecb8 SHA-1: 2378abdf9a4bc9fdaa1ed022594742478fd6b550 SHA-256: f58e502216b57d73e0c1b78937a9406120619665073ee009f2997c06ec6cb34c
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm, suggesting a malicious intent to drive traffic or distribute malware. The presence of a UTM redirector link further supports a phishing or malicious download lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=book+series+like+fifty+shades+of+grey PDF link annotation
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/9397207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_602ab83580677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_600a1e2b695d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_6029608d0d57c.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/5234807443.pdfIn PDF document text
    • https://fukorolavo.weebly.com/uploads/1/3/4/6/134639224/6436765.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/fevowit.pdfIn PDF document text
    • http://zamowafa.mywebcommunity.org/algebra_ebook_free_download.pdfIn PDF document text
    • https://ragivigelogupow.weebly.com/uploads/1/3/4/5/134525503/nuvako-xexivikeloj-fafivaz.pdfIn PDF document text
    • http://zusozujowumid.iblogger.org/narexusavaguvabimatamibal.pdfIn PDF document text
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/717674dbe.pdfIn PDF document text
    • https://rowemuvirota.weebly.com/uploads/1/3/6/0/136089617/mixefedamiduv.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/formulae_and_tables_for_actuarial_examinations.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zudozam.epizy.com/formalits_greffe_vente_fonds_de_commerce.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/is_accounting_a_science.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/94905454174.pdfIn PDF document text
    • http://vofofoduwegakuv.rf.gd/rewudopolojulusonezozutep.pdfIn PDF document text
    • http://dukivudote.epizy.com/ielts_speaking_tasks.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/adhesive_capsulitis_protocol.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/vurexulupanitademagivi.pdfIn PDF document text
    • http://tununik.epizy.com/dstv_tv_guide_compact_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/97080134624.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/apgenco_syllabus_for_eee_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/xaxenurimowexufemolar.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/86120662435.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_off00018a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A0C 5064 bytes
SHA-256: 0ea8522a06a3c0b85374e10f1a7bde123b8c09bcf37cf4c3100d566d0d83711b
font_01_sfnt_off00019b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B66 11684 bytes
SHA-256: d6a7fe5d52bc64aaff88b5e860c5c5024302b58d2606c436ba8091d92404af4d
font_02_sfnt_off0001c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C315 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3