Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f435ff91be85fb…

MALICIOUS

PDF

78.9 KB Created: 2021-03-25 02:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b41473029fefec49cb47c888b848bcaf SHA-1: bb4190fee8654805b2dbb5a56be3bc015a1f04ad SHA-256: d1f435ff91be85fb8499f8b315447758973d927ba7531c23dbadd9704f21e911
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with 'https://maypoin.ru/strik?utm_term=are+taco+bell+nacho+fries+still+available' being a prominent example. The document body, though heavily obfuscated, appears to be a lure related to a popular fast-food item, suggesting a phishing or credential harvesting attempt. The presence of many links and the use of disposable hosting point towards a link farm strategy to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/strik?utm_term=are+taco+bell+nacho+fries+still+available PDF link annotation
    • http://center-about.com/marathi_all_bhajan_song_freene1mi.pdfIn PDF document text
    • http://gtomishebs.xyz/45964041204743we.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386830/normal_5fca3b0d53f7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375700/normal_5ff9d2bd8234e.pdfIn PDF document text
    • http://christinaanddavid2019.com/dibumerigunoweu4gjv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475016/normal_6021ee4f27051.pdfIn PDF document text
    • http://kekebum.22web.org/lanebupuj.pdfIn PDF document text
    • http://becloud.website/toxiruponutefokovgg6mq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_603f40ba81732.pdfIn PDF document text
    • http://gufutaca6.xyz/xinumukolu6ocfu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412897/normal_604b539c7c436.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://demoxivefuwuvi.rf.gd/animal_crossing_android_app.pdfIn PDF document text
    • https://cc603790-e41b-456e-9848-d053b607cad6.filesusr.com/ugd/389793_5f048cad772c4f3c8d9cd4439961abea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bofake/lutimuwubibigarukos.pdfIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_58a0e2c0ede8481285546e31b55ea58e.pdf?index=trueIn PDF document text
    • http://tofoxofifu.rf.gd/rolezuxasalajekosiditem.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_b8abf675240f4376bb411e94ca87851d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomuper/26782146486.pdfIn PDF document text
    • http://lenidifumejuvig.rf.gd/angulos_formados_por_rectas_que_se_cortan.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_e43f9b8f9ac744c787d025d94dfe7538.pdf?index=trueIn PDF document text
    • http://diroxowevigem.epizy.com/76673249596.pdfIn PDF document text
    • http://xojapenekoxij.rf.gd/kakisirinisim.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/wallpaper_hd_for_android_mobile.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_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 5156 bytes
SHA-256: 45b0349c8591dcd4cec4fb97f18d893632edc6e7cdcb87d9891c5245b2dc1342
font_01_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 10928 bytes
SHA-256: b31103d0f3d1005a063e3e5411b6178205bb967e9249a87f3fe4aa0b0d51f9d0

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