Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bb7927b54233a6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 12:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96ed5b6227d03776f6d53360ecb42424 SHA-1: 7938a46a80cb4a7db64e007b662537e03ba8a194 SHA-256: 25bb7927b54233a69f65e4027cdcb1672ba8f63c64ed2bc0783c64d7306a871d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to domains that appear to be link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is structured as a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=john+rawls+pdf PDF link annotation
    • http://kbinteriery.cz/userfiles/file/53895611181.pdfIn PDF document text
    • https://highrise.pl/file/xemoj.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/99978348714.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///pomapowofeva.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c644f29f---29457091157.pdfIn PDF document text
    • http://pinxedien.net/upload/files/99599766998.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/7224622297.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/69777783644.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109032357152865.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/buxeluluro.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/jatisoluzobad.pdfIn PDF document text
    • https://people11people.gr/uploads/File/10050331373.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/56895099857.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/5727971149.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/68348646826.pdfIn PDF document text
    • http://fullx.net/files/46467063379.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/56971568512.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/kojurimopujudomusixebu.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109102117359399.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210903084612.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/rixuvukoxitigumi.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/xomonijivuwabunij.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/5613153735.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_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 17500 bytes
SHA-256: 33bf7f47c7b8cb37633da04263d40bf0362ecb47453f2cc7c0b6a97fb2968ab8
font_02_sfnt_off00011d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 10352 bytes
SHA-256: 1a2413b507eaa529fbdbea93b9b068bd4a4f4d19217b4673b3b6f904be3d943d

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