Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab529f3152dc95b…

MALICIOUS

PDF

75.3 KB Created: 2021-03-09 09:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11c7c0694f874be2c3f6c2807b01b45e SHA-1: 1509a849c0044572c41a992204986ecce972b57e SHA-256: cab529f3152dc95b62001d69815aaac11a866cd6c4e8c0b994883553dd54d9a8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to various PDF documents. One of the primary external URIs, 'https://resalured.ru/strik?utm_term=how+to+put+filter+in+brita+stream+pitcher', is suspicious and likely leads to a phishing or malware distribution site. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://resalured.ru/strik?utm_term=how+to+put+filter+in+brita+stream+pitcher
    • http://bbcua.site/tetogutajawetawuzasalevej98yj0.pdf
    • http://getchambre.xyz/49942342306dios9.pdf
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/zalivojagafaw.pdf
    • http://detonic-deutschland.website/qualified_dividends_tax_computation_worksheette5jy.pdf
    • https://kukefilatisila.weebly.com/uploads/1/3/4/4/134498126/femevobope.pdf
    • http://generalmassage.online/bangla_gaan_audio_gaan4k25g.pdf
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/mupewomevawadax.pdf
    • http://logvoz.ru/10999736436m8kv2.pdf
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/28527.pdf
    • https://vororesefuvemux.weebly.com/uploads/1/3/0/8/130813496/gajunerusoga.pdf
    • https://budazibidoware.weebly.com/uploads/1/3/5/3/135386773/xigimevifudadikiwa.pdf
    • https://jorobeperepi.weebly.com/uploads/1/3/1/8/131856290/zifiki-kenafiroluke-fijeje-xutin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fowonaxul/516837235.pdf
    • https://uploads.strikinglycdn.com/files/22e3e0b3-ffd7-423a-996c-0cf935bd67fb/17092882539.pdf
    • https://uploads.strikinglycdn.com/files/b0fe7a20-871c-4720-8074-180693c60fa2/software_test_engineer_interview_questions_and_answers.pdf
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_9a1e3e01c0ad477fbbe986bf76042193.pdf?index=true
    • https://s3.amazonaws.com/daraniwekamidir/be_brave_little_one_book.pdf
    • https://s3.amazonaws.com/bejideba/jegokawajiluwatipigitop.pdf
    • https://uploads.strikinglycdn.com/files/6edc6e40-7a4d-40c2-b266-5fd20d180a1d/philips_wake-up_light_hf3500_01_manual.pdf
    • https://uploads.strikinglycdn.com/files/c1ebd2cb-3427-4db8-b8a6-fb22f572fa12/plantronics_voyager_legend_bluetooth_headset_drivers.pdf
    • https://uploads.strikinglycdn.com/files/58ac7e7e-fe0e-4f7d-8077-b072055ac8fd/gukatutorijopobuzod.pdf
    • https://s3.amazonaws.com/rodigapigeta/vaworekusojebebajoges.pdf
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_c5e530a6d16c4960b50fd2840128e94a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e616.bin
e51acb20ad9ae2baf933beb6ec0fca315f338d271260932358b27a5e1e75447c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 5448 bytes
font_01_sfnt_off0000f87d.bin
a756767e049f76af5a9a883891cecf771db1f8e11c0e2d940871d8868ac76c94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 10948 bytes

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