Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb607de3464d4b28…

MALICIOUS

PDF

81.2 KB Created: 2021-03-04 01:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f961e4e4337f5fe08abee20ded3a2627 SHA-1: 43136fab633ea31d1f20162820864bbdc9faf8f3 SHA-256: cb607de3464d4b283842312757aed697a07bdf070fda0beb34dc871db606e3d2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a malicious link farm, containing numerous external links to other PDF files, likely for SEO manipulation or to host further malicious content. The presence of a 'download' button lure and the high ML classifier score further indicate malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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://resalured.ru/award?keyword=percy+jackson+and+the+titan%2527s+curse+full+movie+in+hindi+download+filmyzilla PDF link annotation
    • https://wuzikixow.weebly.com/uploads/1/3/0/7/130775075/10957532467.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/79904859918.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/how_many_books_of_fifty_shades_of_grey_are_there.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411512/normal_5fda4fafd1ebc.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/6784157.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/nivawepojulawesenelupiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5fd63bb3485a1.pdfIn PDF document text
    • https://vifutezovabul.weebly.com/uploads/1/3/1/4/131408528/xepelimige.pdfIn PDF document text
    • https://sizemerekev.weebly.com/uploads/1/3/1/6/131606963/pojasig_nerizedus_mulumimavom.pdfIn PDF document text
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/9099f7a25.pdfIn PDF document text
    • https://denosofebulapan.weebly.com/uploads/1/3/5/3/135347567/pedov.pdfIn PDF document text
    • http://wowosuseje.22web.org/60113318346.pdfIn PDF document text
    • https://donedujawag.weebly.com/uploads/1/3/4/3/134315137/2171e3be87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemunedipu.rf.gd/bogoh_kasaha_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/wovevovadoseliriza.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/what_is_the_master_cleanse_lemonade_diet.pdfIn PDF document text
    • http://fukesok.rf.gd/how_to_set_up_wansview_ip_camera_on_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/jisitoza.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 5740 bytes
SHA-256: de2a88d9b5efee79f869b4ad6e53291faf1a35be19d63241d09c62a19b743dc8
font_01_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 10860 bytes
SHA-256: 93ff1ed3bef82d6479956f905a0059059cd2cb126995efa258cf7468fabc7683
font_02_sfnt_off00011f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F54 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848