Malicious PDF — malware analysis report

Static analysis result for SHA-256 34400cabbe7627b5…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 02:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88210960ed34217f73e791e7675b81ee SHA-1: 96cb89d9c9f1abc9afced88153094744b4f583f4 SHA-256: 34400cabbe7627b5a022917cdfed5d65d720667f9d5b1c7c40929734128c8f5a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF containing numerous links to potentially disposable hosting domains, suggesting a phishing or link-farming operation. The embedded URLs are likely intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://queure.ru/uplcv?utm_term=pokemon+black+2+randomizer+nuzlocke+download PDF link annotation
    • https://premium-house.uz/images/file/10287055118.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4ff4cc969b5a5e50acc810491fb8ddad/47162818257.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///rurilitovadamino.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b75088f4fd---65496193237.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/sabibudixonasabep.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210904_D3C42BE67A22BEC0.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/kivituxawix.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/xutidakavizapek.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/jifuridawimeb.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/10260880571.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/2098954266613321c22dfd3.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/66611445069.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/47348600644.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/68646095325.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/80551538030.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/goxumanoxiku.pdfIn PDF document text
    • https://equinox-e.com/upload/files/76234215194.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/davozafexurumekominuzino.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/9851160352.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/05/xevivirewiwogamalodo.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/98558633886.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/palenanevabaki.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/19307213512.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_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 10864 bytes
SHA-256: 39950fd5dce736b88bef2f17ed8d075bcfa3a2a74ca9c09534d0c94f7a3dd443
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 18820 bytes
SHA-256: 1f87241411cfcb710694cdc426c80dbbc21b480a77977e7b39305b03c740dcf4
font_02_sfnt_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1