Malicious PDF — malware analysis report

Static analysis result for SHA-256 8625fbfa224a438f…

MALICIOUS

PDF

78.5 KB Created: 2021-02-27 23:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d91f60a85fb6f45897e3d9d583c3c60c SHA-1: 2481df888a3369c8aff56688ca084d20e6da819a SHA-256: 8625fbfa224a438fbbf44f07b4b88b89db8778edd50db4fc6de0d9d1e4e4cadf
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to obscure the true malicious destination. The primary malicious URL identified is https://golowaki.ru/123?utm_term=breadman+bread+machine+manual+tr520, which is likely used to redirect users to a phishing or malware distribution site.

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://golowaki.ru/123?utm_term=breadman+bread+machine+manual+tr520 PDF link annotation
    • https://togazozaxezux.weebly.com/uploads/1/3/1/6/131606461/2040258.pdfIn PDF document text
    • https://penaxixix.weebly.com/uploads/1/3/0/8/130813526/8290588.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/nikon_prostaff_3-9x40_silver_bdc.pdfIn PDF document text
    • http://bogplaktnc.fun/how_to_reset_iomega_storcenter_ix2p57wc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482402/normal_600b4b150a22d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_60325e0e35095.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/fajosetudixofiwo.pdfIn PDF document text
    • http://spencermcman.us/tesseract_ocr_to_imagebaw6l.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/43226274263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481528/normal_602d2e2da269e.pdfIn PDF document text
    • http://romeoplanet.club/xanaturaor16.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/korula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381735/normal_5fcd87e06de7d.pdfIn PDF document text
    • https://nusepetuvake.weebly.com/uploads/1/3/3/9/133997573/bubivopu.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/1f3412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412895/normal_601819eed0244.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/mefadedosuw/pk_movie_cartoon_video.pdfIn PDF document text
    • http://dikazimizoban.epizy.com/bitcoin_logo_free.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/cuisinart_ss-700_parts_diagram.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_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 5588 bytes
SHA-256: 59ca071c129431f193a7047cec57e00fd9f69da6537952555c70164c3f148ebd
font_01_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 10536 bytes
SHA-256: dacc3ac1c12bf6c4d3d4512f1a37c5f86adf5a6f86bb25274a43b66bbe043ba8

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