Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cd3ea31636d2ba…

MALICIOUS

PDF

88.3 KB Created: 2021-05-25 15:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7ed3c582a2460c8ea087b6674c17b3da SHA-1: 08d8171b55a9471331180edca4e62dde5389458d SHA-256: c0cd3ea31636d2ba8e29bda326327bcef23bc4aeee0b167b2514ef5d189f1e5a
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://maypoin.ru/strik?utm_term=oxford+dictionary+and+thesaurus+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388279/normal_606a08411dd81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501029/normal_5fc8af3a5a36c.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/0d05c89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423145/normal_60390bb9e266b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402244/normal_6004bcfedbbd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482648/normal_5fe1eff19cc25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488842/normal_5fdea1f9866aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403680/normal_6040259732bb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484818/normal_5fdedb11a4af6.pdfIn PDF document text
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/2353771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481417/normal_600ccfbfba9d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_604d1d87aad65.pdfIn PDF document text
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/nopezemop-gonivenodamaz-lazoko.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/jitimesolagun/rolejajunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddbb618-d053-48f9-b4d9-b4a456ef2664/hp_laserjet_m1212nf_mfp_printer_toner.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/alphabet_worksheets_for_playgroup.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/captain_marvel_trailer_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a788d7-3a43-4270-aed7-58d0fc8e9842/44656000153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b71bdebc-8c3c-4af3-b487-8935f58cb970/84259137520.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/teaching_by_principles_4th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/tenvis_jpt3815w_manuale_italiano.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_off00011a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 5408 bytes
SHA-256: d2bd5ddd782c9e1e68224676fdbb0e51f03c787f5d836a536be2f71e18ad15bb
font_01_sfnt_off00012c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C96 11576 bytes
SHA-256: 890fba4727a3c82004dff4ceff81e7b89c69dd035f64f08924541be67bdc5443

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