Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28dfc6e9f503a72…

MALICIOUS

PDF

98.3 KB Created: 2021-03-23 18:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a7318120d602296d7e255ef6c1ed0279 SHA-1: a164f5aafe3667c2b19b9608cc07de8831649425 SHA-256: d28dfc6e9f503a72d7b6a951e7c16bfa26393e67ac6a5ebac3e473adcb514d85
156 Risk Score

Malware Insights

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

This PDF document employs a link farm technique, presenting itself as a free handbook download to entice users. It contains numerous external links, including one to a suspicious domain, likely serving as a lure for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=ashrae+fundamentals+handbook+free+download PDF link annotation
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/notavinodaleziziti.pdfIn PDF document text
    • https://togezajotutev.weebly.com/uploads/1/3/0/8/130874352/basugaravoli_dofera_dazapafe_xazusaboga.pdfIn PDF document text
    • https://wobubowez.weebly.com/uploads/1/3/4/7/134709338/lidixokepik-xidowamejux.pdfIn PDF document text
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/seruremuluzi-vefipaw-tonexuw-gevipoj.pdfIn PDF document text
    • https://xobugozo.weebly.com/uploads/1/3/0/7/130739897/bedb229f24e27.pdfIn PDF document text
    • https://zekawumili.weebly.com/uploads/1/3/4/4/134403966/tarirapav.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/cf368.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/wugetebijusiza.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/magapeguwabe/57503385839.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_a1da40b46c964bff8677d830844cdbe8.pdf?index=trueIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_2669e6ee15a04cb995bb551c7f6cd7c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/dark_souls_1_manus_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/kalnirnay_calendar_2016_marathi_free.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/fiddler_on_the_roof_setting_crossword_clue_nyt.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/91569163379.pdfIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_6f79ecd713a64b1c92094967e2e2fb72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/jaspersoft_reporting_jobs.pdfIn PDF document text
    • https://5da1c7d8-01c4-4175-bbf8-c25915566394.filesusr.com/ugd/1084fb_37403fda4c9a43cca1b92be00a082679.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_a74ee64e48a84726be80042f0b5261a6.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_daa04d90af0942e0a73442a426c6f9c5.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_69ec6cf6c980462e81bbfdeb91004269.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/33574202737.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/peavey_classic_30_112_tube_combo_amp_review.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/sorivumununubojipex.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/who_made_the_first_cheese_puffs.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_off00013a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2C 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off00014427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14427 5432 bytes
SHA-256: 4d1a57c3a54cf39b06c770f1a5e2607f80020921e2d0cd366b464ef167733344
font_02_sfnt_off00015686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15686 10796 bytes
SHA-256: 9217968a7421c6db6d2ec2afcbb38a850f12d10bedb2139f53c2010efb2981d1

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