Malicious PDF — malware analysis report

Static analysis result for SHA-256 89053e8b939f5bdf…

MALICIOUS

PDF

71.1 KB Created: 2021-10-07 17:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 374838eeb0c31032ab93b4d4fded0181 SHA-1: 463acd5afa54c5ef2b2f6de95ec38911b78bab32 SHA-256: 89053e8b939f5bdfc4a4824b1b95770454b9bc2fc74efaba783e9d8574a839ac
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external PDF links, many hosted on unknown domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this as a tactic used in spam or phishing campaigns to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://elmbbq.com/uploads/files/69113735110.pdf In PDF document text
    • https://butchercurnow.com/img/shop/contents/28987221843.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/rifowidaza.pdfIn PDF document text
    • http://vollaracis.com/UserFiles/file/sinusetewi.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/mexolog.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/71560040138.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/85119966297.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/lonirefapunebiboxujeda.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20211021448289512.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/66875302771.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a4b0e4f19b885697d2f27e704f810751/zivad.pdfIn PDF document text
    • http://billsky.ee/files/file/disulobud.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/26065900160.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/85293018759.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/91673960350.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0ed1abf2---voxuzafon.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/93212440085.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/57509758299.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/waforalunemekawajonagulu.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/14894775636.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/literekidokanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=laxative+in+a+sentencePDF 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_off0000b382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB382 17468 bytes
SHA-256: d4e7185317818b54993a26493aa6758538a74f9044097392030787f481556743
font_01_sfnt_off0000e075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 10084 bytes
SHA-256: 9f95e949405d68ce24477c853212c8265089c6f388b153dcf455a3a548692471

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