Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dad8c61772bde4…

MALICIOUS

PDF

73.3 KB Created: 2021-04-18 18:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 339680951872b9b11a058b0b1eaa1815 SHA-1: 5b0c85fe38cce517493226cea357ab37bfadca23 SHA-256: b7dad8c61772bde491f1f127d821cd27941e2702c9bc54786d47f379e02d473f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF structure point towards a phishing or malicious redirection attack.

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://bologen.ru/strik?utm_term=dell+xps+420
    • https://cdn.sqhk.co/luwesefizi/hpGsHii/miretaxubadirek.pdf
    • https://cdn.sqhk.co/sinemajud/Ribhhhf/nasacort_inactive_ingredients.pdf
    • https://cdn.sqhk.co/kexofodatop/cvpOhes/double_bubble_tea_house_prices.pdf
    • http://lokalumamone.iblogger.org/41330975145.pdf
    • https://bewupisobafa.weebly.com/uploads/1/3/5/3/135340617/tipidunapob.pdf
    • https://cdn.sqhk.co/soziwariru/javYBic/71632258622.pdf
    • http://dogorove.22web.org/keredilajodorewajajumuta.pdf
    • https://cdn.sqhk.co/jipuxoxukul/cbr4wLR/music_making_software_free_for_mac_os_x.pdf
    • https://barosowuni.weebly.com/uploads/1/3/1/3/131398377/9319548.pdf
    • https://cdn.sqhk.co/zufutetuwume/DiilidZ/pioneer_smart_sync_app_iphone_android.pdf
    • https://cdn.sqhk.co/xivovido/ggghcCa/33969500121.pdf
    • https://cdn.sqhk.co/keliziniw/74UpjeG/47622945333.pdf
    • https://cdn.sqhk.co/nonatedogo/gepSgt9/wimufatazatif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_f36b106168604889be76b905148e04a5.pdf?index=true
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_089d6fb626b74a64a0d8ca1a2a550db0.pdf?index=true
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_a5dc3e93e6ca4a98b02d0fc480450103.pdf?index=true
    • http://dedefujog.rf.gd/59459623942.pdf
    • http://segalufosirinep.epizy.com/verbs_followed_by_gerund_and_infinitive_worksheet.pdf
    • http://zedaziwubisod.rf.gd/magnetic_effect_of_electric_current_class_10_notes_download.pdf
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_be8befbc9b1640cf837739a66a3bc042.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_off0000e3a7.bin
2314d4a300352d5f897f9c7088b17e9d2819adcc1a8671e3e224ba417b661321		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 4936 bytes
font_01_sfnt_off0000f49e.bin
8baa7f129a95f08935aac7ef1ebae3fa5a1923726fd152fff6e2474084504c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 10548 bytes

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