Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef8a50861e3798e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 18:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb6bfe853628fc190d55e3726e56e91f SHA-1: aa63158c6bcec0f641ba06b86d018184844a3268 SHA-256: 5ef8a50861e3798e03ef4a910806816bd62e057fb71de4578f5c4074bb8e808a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, one of which is a link farm designed to redirect users, indicating a phishing or malware distribution attempt. No scripts were extracted, but the presence of external URIs and the overall detection suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://archism.ru/uplcv?utm_term=desarrollo+de+aplicaciones+android+pdf PDF link annotation
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofagedazarosakegikewulo.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/golorasezu.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/34347513284.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/rawobog.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/tokapixabizapivig.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/noloxipidotumejajurujar.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613deae726132---xoludun.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/71176943109.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/wagoletezab.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/64523320696.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/pozavad.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/vefodenetonowevufizuvom.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/kinesexov.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/93547552059.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/96653399337.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/mubetagoxo.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/vasudedifavolozaxebi.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/46230738184.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906001646.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://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_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 19144 bytes
SHA-256: 9f412f044b7bacb735c1dfcb95f43f0d711a10862d03ab4b9762a189daf1d92d
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 10516 bytes
SHA-256: 91b9172a467e4a51a400e92b5fb7dd02c429619bb8fc0de515f6d6d75b7ccf40
font_02_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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