Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb99a5637042023…

MALICIOUS

PDF

61.2 KB Created: 2021-06-01 17:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab78c3d956385eb92a9c5c75f052bb18 SHA-1: d9f036fa68c7721b0065d388d3a3f21cbeb05821 SHA-256: 0bb99a563704202385440c2aead753504a042461a5701e3afcb1c5b4ede4983a
184 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The heuristic firings indicate a high likelihood of malicious intent, specifically related to SEO link farming and potential phishing. Although no scripts were extracted, the structure and URL distribution strongly suggest the document's purpose is to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8267

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
  • 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
  • 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://pixomot.ru/pbw?utm_term=manual+lymphatic+drainage+massage+techniques+abdomen
    • https://dexanobibe.weebly.com/uploads/1/3/5/2/135299911/c15933893f5dc01.pdf
    • https://gigorevexi.weebly.com/uploads/1/3/4/7/134714530/tazid.pdf
    • https://lopuradusat.weebly.com/uploads/1/3/5/2/135297354/149686.pdf
    • https://warimeso.weebly.com/uploads/1/3/4/7/134720830/3cedbfbda.pdf
    • https://dawewixorumerix.weebly.com/uploads/1/3/4/6/134633471/wewadi.pdf
    • https://jebezowurexa.weebly.com/uploads/1/3/4/5/134576847/xerogarubej_kuxugeneniwidob.pdf
    • https://fozunisomizu.weebly.com/uploads/1/3/4/6/134666093/ab2b93c69c87.pdf
    • https://xikeremu.weebly.com/uploads/1/3/4/4/134499192/senuvunutame.pdf
    • https://riderasal.weebly.com/uploads/1/3/0/7/130738784/watudoj.pdf
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/kuwamobadituwuru.pdf
    • https://xojenupikubola.weebly.com/uploads/1/3/4/7/134747345/2324f2b4a74.pdf
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/sexat-sixopon.pdf
    • https://balalowomave.weebly.com/uploads/1/3/0/7/130738893/8506661.pdf
    • https://taxufizewafodo.weebly.com/uploads/1/3/4/4/134477277/9125022.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ziduzobif.pbworks.com/w/file/fetch/144436884/1433744177.pdf
    • http://rujuboxu.pbworks.com/f/27100822098.pdf
    • http://tusawijer.pbworks.com/f/xisoboxepetaletupoxoze.pdf
    • http://wusagem.pbworks.com/f/apocalypse_of_zephaniah_text.pdf
    • https://uploads.strikinglycdn.com/files/e16c513f-1b61-47bd-8c04-92109f05f55a/17373881482.pdf
    • https://uploads.strikinglycdn.com/files/a7036047-44b3-406b-9cbd-44762de7987e/borges_ficciones_english.pdf
    • https://uploads.strikinglycdn.com/files/f8c3db27-7cc3-4692-bb09-75a19c70becb/how_to_calculate_discount_rate.pdf
    • http://kokoxudalux.pbworks.com/w/file/fetch/144428031/67346489835.pdf
    • http://zowonixepor.pbworks.com/f/40147096061.pdf
    • http://garifukedako.pbworks.com/f/41002469009.pdf
    • http://lijegazoz.pbworks.com/f/cost_to_replace_flame_sensor_on_furnace.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e8.bin
9c75d376cb45864a289ba3fcce7fd001d2e2dbc44168ac0a6d2591ba4176bc86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 5860 bytes

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