Malicious PDF — malware analysis report

Static analysis result for SHA-256 1619673a04bbdfa9…

MALICIOUS

PDF

76.5 KB Created: 2021-03-14 21:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4556fd56caf23c748bdfe81da5de97d SHA-1: b3ef097d17d464f0f0fdc993eac85f92687a551d SHA-256: 1619673a04bbdfa9187e516fc361c6dc5babfa0f11842aeef072d27a4605d1ff
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains and files, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/wix?keyword=gene+and+chromosome+mutation+worksheet+key
    • https://tuxemadoja.weebly.com/uploads/1/3/2/7/132712185/rapop-fufekojogijaxiv-xowife.pdf
    • http://50off.pro/sekujijeribexarehm1xw.pdf
    • http://jadebey-x.com/comcast_xfinity_home_security_app71k6i.pdf
    • http://circulshtangcalip.website/89858676273z83dd.pdf
    • https://widafesisitix.weebly.com/uploads/1/3/5/3/135321065/869c19f03f.pdf
    • http://fesabip.iblogger.org/paveriko.pdf
    • http://milky-rp.space/570933312064ohux.pdf
    • http://beautysss.site/carry_on_bag_size_limit_emirates3kzlp.pdf
    • https://noxiwufozale.weebly.com/uploads/1/3/0/8/130814513/fefipuged.pdf
    • http://nigoguno.scienceontheweb.net/excel_formulas_list_marathi.pdf
    • http://joweponula.mywebcommunity.org/administracion_de_medicamentos_via_intramuscular_fundamento.pdf
    • https://vewiwuxipax.weebly.com/uploads/1/3/2/6/132681682/9185145.pdf
    • http://sepibigejakina.22web.org/story_elements_worksheet_grade_2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dufenujel.rf.gd/83901410372.pdf
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_acb70c42ee424bba8d6a3688fdc7e05b.pdf?index=true
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_f3dc6b3f43e44ab088141c661b71793c.pdf?index=true
    • https://s3.amazonaws.com/bexolamabad/anest_iwata_compressor_manual.pdf
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_b010b51980584e6883d9b6ceefe6052a.pdf?index=true
    • https://s3.amazonaws.com/didowugorokirug/android_ndk_samples_github.pdf
    • http://vasogumideku.epizy.com/86099602447.pdf
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_4a58401f36d44f7a8acf6029958b416e.pdf?index=true
    • http://telusomabufa.onlinewebshop.net/72529139402.pdf
    • http://widusop.atwebpages.com/49167086297.pdf
    • http://gozejozonamolub.rf.gd/gnarls_barkley_crazy_instrumental.pdf
    • 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_off0000ef39.bin
21ffad611264fe822c18d001975b98458459069631fd4f4b7c6f1ffebcf9c493		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 5436 bytes
font_01_sfnt_off000101a5.bin
44942c9b4982ba9e9766fe00d4badd7b72113f1bb9ea0ed48cf876ed6ce920b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 10196 bytes

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