Malicious PDF — malware analysis report

Static analysis result for SHA-256 4150f72bb3d8cb7d…

MALICIOUS

PDF

86.1 KB Created: 2021-03-04 08:11:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8023b56544077514d7b82448b7ba1800 SHA-1: d460c97123229bde3ac0eed03c5587cdadeca099 SHA-256: 4150f72bb3d8cb7d56c2ae67d6be411c4b3d7e3c901ad87ea952e4a6ce4c61f6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'fokemale.ru', which is likely a malicious domain used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://fokemale.ru/award?keyword=six+of+crows+pdf PDF link annotation
    • https://lopolovugafi.weebly.com/uploads/1/3/4/1/134109017/3c278a8753944.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/vutomenimovabafezu.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/what_is_hardware_and_types.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/sims_3_pets_ps3_dlc.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/zisumozosam_zosokobejabozag_zenimuzokiru_kukuliguvatuju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tevigotu/download_autocad_trial_version_2019.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/6713611573.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/factory_reset_android_7.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/tekken_6_for_pc_apunkagames.pdfIn PDF document text
    • http://panafinuniro.epizy.com/butter_lettuce_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/missouri_confidential_case_filing_information_sheet_codes.pdfIn PDF document text
    • http://legosipado.rf.gd/how_to_charge_jaybird_freedom_without_charging_clip.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/kivugupanaxugu.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/4524251773.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/77400352226.pdfIn PDF document text
    • http://kegepedefaripi.epizy.com/lutaxutadu.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/19442037175.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 4652 bytes
SHA-256: 7d84ff64960584db7682e7bffe5fb7b91df981ce3e7cf18575f2e1af141786da
font_01_sfnt_off00011ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 10064 bytes
SHA-256: b06ddfef1d42f40a4f4e5ba4175074c4e08de5a0b01b73a3e6af44519212b045
font_02_sfnt_off00013d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D37 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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