Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f6d1ea97f12d59…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 10:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aed7bfeac80ddeac11a9098267452567 SHA-1: a726006cc8de5b04c4f12ec4d4b6a0b84b253a8c SHA-256: f5f6d1ea97f12d592f21df1eeed8dc96013ca342c9364a7c2fbc4aa74abdaabd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm on disposable hosting. The presence of ML_NYX_PDF_MALICIOUS and ClamAV detection strongly suggests malicious intent. The SE_CALLBACK_LURE heuristic indicates a potential phishing or tech-support scam pretext, although the document body was too malformed to confirm this directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://allytemp.ru/uplcv?utm_term=game+booster+4x+faster+apk PDF link annotation
    • http://chukguwang.com/files/fckeditor/file/5669520157.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/22827145254.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/74363416631.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/gosejeju.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/12936913792.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/rovefulipugilawuneguf.pdfIn PDF document text
    • https://bliznacite.com/files/mofunezutanajufabodaxo.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/7741906582.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0631291001630770616.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/pirilomevasugonagunusiw.pdfIn PDF document text
    • http://chinazzjx.com/d/files/modekegimonifijabigiwed.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/dugemonurinon.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/viberipal.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/63893699760.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/betonumekukiwa.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/70311768225.pdfIn PDF document text
    • https://moolans.com/uploads/files/lamafikibifabar.pdfIn PDF document text
    • https://sharenkon.com/files/vosajomeweva.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/97976092495.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/47089287132.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/76267942704.pdfIn PDF document text
    • http://rem-proekt.com/f/file/rowegijusupolijur.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362c2ff25d8---15721064572.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/lulodezamotir.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/79155452866.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDA 10728 bytes
SHA-256: c212eb85a3f3023356985f5d79489b12402fcd20777b47875e403f6f579289b6
font_01_sfnt_off0000c869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 14440 bytes
SHA-256: 48157f480e10e4e51bffb741664db23ffbbe148220cf0dd252c21ed1f3747c75
font_02_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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