Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dc822bd3f1e4d7…

MALICIOUS

PDF

77.4 KB Created: 2021-09-14 09:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8603aff7a24a220382c2d8e2cbfe90f0 SHA-1: aa6d683ff0b74de04eba56815351ec333b541924 SHA-256: 63dc822bd3f1e4d701ce66ee0af082d300e82e82ab8cff1a821879cb1708022a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, likely another PDF or executable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 http://langeline.com/ckeditor/upload/files/wisakasigupu.pdf In PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/30991164116.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/nopuxa.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/78792963663.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/pizunifoxipidadaritaj.pdfIn PDF document text
    • http://greenld.com/userfiles/33585490369.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/litimalosesakasofix.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/88478082739.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/dunawuzurat.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/85377047719.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/89049398480.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/16a87ca13bf83355b50ce91d597f5efd/rubitabalesepesisosoligez.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/73811586337.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210907_62126C86E779822B.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/dubifememobozivexesetu.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/pafejexeropedirezini.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/06044bc0634b609507f49a01a94963a5/zapodowubebujubowe.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/bidaju.pdfIn PDF document text
    • https://kenadong.com/contents/files/42456681644.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/2895745564.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/beganepisuvukujuxosufuga.pdfIn PDF document text
    • http://etnorom.hu/pictures/getebiridiridobokuwox.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/winiwosawobafozepopub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+7+install+apkPDF link annotation
    • 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_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 10376 bytes
SHA-256: 231ec586925f844731ed96e0c710dd1585b0dc949b059d4ec6d60e26014f295a
font_02_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 16672 bytes
SHA-256: 6898d18aed98baa1aa7296fdb20fdf0b5e3de3e78643c3f62cf5361f90b75d28