Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d0a2ff60e14025…

MALICIOUS

PDF

74.5 KB Created: 2021-03-24 20:10:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 10cf5980bb6531c021a69362c1b2154e SHA-1: e59e768c5905a910108210066e16080dd99b9d01 SHA-256: b7d0a2ff60e1402539ee417f6b1564dc0b14e8d09e0d1f47a83ef8a008adfae8
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to contain references to 'statistical tests pdf' and 'wkhtmltopdf', potentially serving as a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/award?keyword=statistical+tests+pdf PDF link annotation
    • http://trastqort.online/how_to_reset_currys_essentials_dishwn0cq5.pdfIn PDF document text
    • https://nupiwezorebor.weebly.com/uploads/1/3/4/7/134715096/cea7c6e2672.pdfIn PDF document text
    • http://grizhoff.ru/wejizabudu3roey.pdfIn PDF document text
    • http://sell-toclick.online/hoover_windtunnel_max_capacity_petbjak4.pdfIn PDF document text
    • http://vixabaj.scienceontheweb.net/maxokuzeni.pdfIn PDF document text
    • http://zujuzerawijuk.medianewsonline.com/how_to_train_your_dragon_show_order.pdfIn PDF document text
    • http://lamanixumerad.mypressonline.com/kofofemimowajev.pdfIn PDF document text
    • http://localdesign.me/ryobi_31cc_weed_eater_spark_plug_gap7dmhg.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/mijenugatusak_biloge.pdfIn PDF document text
    • http://kemedejovon.getenjoyment.net/cahier_des_charges_garderie_scolaire_tunisie.pdfIn PDF document text
    • http://remont-pc.website/when_you_love_day6_lyricss9b4y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/74867425681.pdfIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_3d3f01cc01ef48bca37056ed91c65039.pdf?index=trueIn PDF document text
    • https://c20a02f1-eded-46de-afbf-2d7328e03b26.filesusr.com/ugd/c6fd25_b022d91b9811459daec10bc8909dee1c.pdf?index=trueIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_d1665bd8a218450ea76fa25cf3655170.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf5a075-2c23-4951-a8fb-2c9078d69f8d/how_many_calories_in_a_krispy_kreme_cream_filled_donut.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/jodopokekowifinavoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/944faf3d-c024-4e7f-b4fe-841bf551fd5c/how_much_does_a_medical_lab_technician_make_in_new_york.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c06f4af-5213-4210-99ba-d636d53e5161/wipolaneburoxasagis.pdfIn PDF document text
    • http://wazipegemezen.atwebpages.com/de_cero_a_uno_peter_thiel.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_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 5156 bytes
SHA-256: 4e786e6b28d0d66d6d420cf9a5a45a7427403bd0e03f178ead8c00d6b54019e9
font_01_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 10836 bytes
SHA-256: fc2964319a4ff1de2dfd4cbe2205f0c24ca52745b32368649caf91d1f3b86662

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