Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff2694ac833cf6f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-28 08:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 574c3aeb0699dde35138709f5837a650 SHA-1: 7998a584bd279c1f5739a0eaa3ea0ff73f190375 SHA-256: 4ff2694ac833cf6fca3d93a0bb43d10e18031ce34514417ef2893760defa86e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are embedded within the PDF document itself, suggesting a phishing or scam lure. The presence of external URIs and the 'link farm' heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://garglob.ru/uplcv?utm_term=pes+2016+obb PDF link annotation
    • http://prompol.com/media/file/sebazufiwadorelego.pdfIn PDF document text
    • https://cet.sk/res/file/42502728088.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2559017e7---58329281590.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/11698104516.pdfIn PDF document text
    • https://12shio4.com/contents/files/63048481265.pdfIn PDF document text
    • http://klinok-saintp.ru/files/nexodowif.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jiginifub.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/sotegaxewogagubunamega.pdfIn PDF document text
    • http://ginkgokatsudb.com/uploads/files/dabinelejeneba.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/vufiwijitawuta.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/jonulumoxunowubigenedexi.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210928003025-xakadujewilozutedijel.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631922284.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/maxazanakib.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/rilubo.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/67237622891.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/vosusugibiji.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6356e1c72---54435780836.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/89724553930.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/mifexudoxajupurixok.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/viliniwepada.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/45126267829.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 10100 bytes
SHA-256: c26466d35f6c7b5849e9a0f2489ab2652b5c636d3641cd6e8ee84a9e7427fbf6
font_03_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 23856 bytes
SHA-256: 0c5e4b4bf0e12b4a802c18ae5e7feda0705d9a600674a515b5fae33af8f30e18
font_04_sfnt_off000138bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BB 1684 bytes
SHA-256: 9c928bf144e3eec6b0e52ae2bba533670589b2228405e28e178bb89e049a64b1

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