Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd68a40e43e2079…

MALICIOUS

PDF

69.3 KB Created: 2021-03-18 07:09:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a5823576560e3bc9a0ad0f13b9f1e52 SHA-1: 2b95b9bab29ce4672f6d70802fe7260fc81d514f SHA-256: 9bd68a40e43e2079fc8f29213b30fdf00726c87585551cfda75cf5b62d8eeb4b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The primary URL, 'https://pelibifir.ru/strik?utm_term=venta+airwasher+cleaner+8.5+oz+clear', is likely part of a phishing or malware distribution campaign. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=venta+airwasher+cleaner+8.5+oz+clear
    • https://kuvezuwuziteb.weebly.com/uploads/1/3/4/3/134388010/pakuburelo.pdf
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/316535.pdf
    • https://kefuvavubuxega.weebly.com/uploads/1/3/1/1/131164002/bidetenotodofibel.pdf
    • https://cdn.sqhk.co/sononipo/kYihgjm/71337875419.pdf
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/kagezobuxo.pdf
    • https://cdn.sqhk.co/sudizatase/fVgdMhd/free_blank_funeral_program_templates.pdf
    • https://cdn.sqhk.co/xataruzepape/epE4uTQ/gibagiledob.pdf
    • https://cdn.sqhk.co/pabelewexo/ks4DF1Y/foam_craft_paper_sheets.pdf
    • https://cdn.sqhk.co/xasakeza/igiUTid/31752807954.pdf
    • http://nuzarekuzugav.mypressonline.com/child_autism_spectrum_test.pdf
    • https://xupovefodifej.weebly.com/uploads/1/3/6/0/136053951/7683709.pdf
    • https://cdn.sqhk.co/totuzilexif/fYhf26A/3724570751.pdf
    • https://cdn.sqhk.co/vixemujomu/guVjbEd/36922882956.pdf
    • https://cdn.sqhk.co/xurazegoba/ghThche/horror_house_escape_room.pdf
    • https://cdn.sqhk.co/bomaguvodar/hiWiiHl/8908451727.pdf
    • http://suwefazimim.medianewsonline.com/tubagatolefaxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rezugekolaba/62727893842.pdf
    • http://vupaguriwedizid.atwebpages.com/37271526607.pdf
    • http://jevusavisa.epizy.com/christianity_today_magazine_submission_guidelines.pdf
    • https://s3.amazonaws.com/gajakelegeza/smith__wesson_date_of_manufacture.pdf
    • http://pitidurafekuji.rf.gd/wejeginegedu.pdf
    • http://zawanaxakav.epizy.com/8535351454.pdf
    • http://pabudixobo.epizy.com/979672788.pdf
    • http://duxepivol.myartsonline.com/viwedakadisizofuresorom.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa9.bin
9a47c40312551e058c0f67b3c31a66367df48543acb085b0d29426a0109e6a3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 5344 bytes
font_01_sfnt_off0000e1f6.bin
dff7ca546e5643a25da4a40b9263a1ab1843ed61f1c1afa29fedb418dade0219		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 11108 bytes

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