Malicious PDF — malware analysis report

Static analysis result for SHA-256 56106ca1b2f259b7…

MALICIOUS

PDF

83.0 KB Created: 2021-03-29 01:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ab848cb05998b217d4f2f2851ed74694 SHA-1: 9a2e074611cd49ce7782adfd4662bed365b19b57 SHA-256: 56106ca1b2f259b7e6749b3984d71dd9fc56ff3fbd6f055a0615009f3682bc4c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. One of the primary external links, 'https://xajibur.ru/award?keyword=cancioneros+para+guitarra+pdf+gratis', indicates a lure for free guitar songbooks, likely to disguise malicious intent. The ClamAV detection and ML classifier strongly indicate malicious content, likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://xajibur.ru/award?keyword=cancioneros+para+guitarra+pdf+gratis PDF link annotation
    • https://zejewovelopitut.weebly.com/uploads/1/3/0/8/130813539/nesovujuvi_resivusil_vatemazusifew.pdfIn PDF document text
    • https://badosajag.weebly.com/uploads/1/3/1/4/131407507/f16a9401.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/5858319.pdfIn PDF document text
    • https://zefulesemed.weebly.com/uploads/1/3/6/0/136021217/vakisalovup.pdfIn PDF document text
    • https://gojaxuwawozupu.weebly.com/uploads/1/3/1/0/131070912/sopojipokupun.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/23d99a.pdfIn PDF document text
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/8867685.pdfIn PDF document text
    • http://gagafelame.22web.org/garmin_vivofit_jr_stretchy_bands.pdfIn PDF document text
    • http://reduslim-shop.site/the_solar_system_quizleteroxn.pdfIn PDF document text
    • https://tumipipap.weebly.com/uploads/1/3/4/5/134598024/602b7.pdfIn PDF document text
    • https://riligasiguvenu.weebly.com/uploads/1/3/5/3/135392009/raxovawiluvuwej_lawimosu_dejugire.pdfIn PDF document text
    • http://sallehub.xyz/fountas_and_pinnell_running_records_scoring_guidermc0d.pdfIn PDF document text
    • http://table-wait.com/57725461732w9xd1.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/tobovunoberiki/arjun_r_meda_video_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/how_to_pair_auvio_speaker.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/43281840729.pdfIn PDF document text
    • http://sobawen.rf.gd/73245030873.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/zipigigetapenusi.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/play_store_game_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/sokuxojizobowufep.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/personal_statement_for_college_template.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_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 5196 bytes
SHA-256: b668808059dcfbbd3214158412a46280f3d17fc650fd65c93bdafad7ad497223
font_01_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 1888 bytes
SHA-256: fb837d8d2e7b6ff876074993d1faa48c00f8652074d5e7b79bdb67b3eeb562c2
font_02_sfnt_off00011659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 12048 bytes
SHA-256: 3b9dd26fd664e40e1db0a8b042370532b391a65a147ccec52b1b460d04ff9874

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