Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2534fba2e92ebac…

MALICIOUS

PDF

79.5 KB Created: 2021-04-17 06:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 52b82f76eaa58495f04cbb48e3699a4f SHA-1: b23b280be6bbbb7a66fa488e3e0d8a6c217c81f3 SHA-256: f2534fba2e92ebac1ed906bc1f60b45d19178ff3f86aede4324ecaee38b2b4c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=interview+questions+with+sample+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481280/normal_602f297de9717.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454426/normal_5ff927f31cb1c.pdfIn PDF document text
    • http://firstsecu-paypal.com/how_to_workout_your_legs_with_weightswmt8s.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/dU2gdeb/39697626062.pdfIn PDF document text
    • https://ketafimevudo.weebly.com/uploads/1/3/1/6/131637081/5008906.pdfIn PDF document text
    • http://complect-tech.ru/nowukofukosiwokevuxewo0dspq.pdfIn PDF document text
    • http://cocobuka3.xyz/minna_no_nihongo_1_mondai_answersakdbr.pdfIn PDF document text
    • https://retuxuzuj.weebly.com/uploads/1/3/4/6/134688644/kawixa-newovemituwos-zubukosig-kuribexik.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/jaduhcP/how_to_draw_marvel_avengers_logo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_601d3bdd98eb6.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/976d540a-99d6-4d4b-879b-0218c03bf7df/33300091128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e4d036-da99-42ce-8945-78960614ca0e/zapomunifewanizolup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99938f46-c185-460f-9224-d49ebfa60da1/how_to_install_graco_4ever_car_seat_forward_facing_with_latch.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/gikogekapudazibuvejuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1515fbbc-c3dc-42bc-aa72-52c45e0adaea/54065488582.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/53904542508.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_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 5496 bytes
SHA-256: e406c6f7a777f22396d1e3c0fbb44c6a2746f01c24f2c0acf4f0c0da7ca43439
font_01_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 11036 bytes
SHA-256: e06d30459e046a791f54e6b87b79295f98154d4b31ca0acdbf0430cc4ee07d88

Open this report in the interactive analyzer, or submit your own file for analysis.