Malicious PDF — malware analysis report

Static analysis result for SHA-256 1600892ac0842bf9…

MALICIOUS

PDF

87.4 KB Created: 2021-09-16 21:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eee181b3ae6ef334d2c13bd33b85ba89 SHA-1: 7199d78dcb93dd3823926abe6eed5108cd86c34a SHA-256: 1600892ac0842bf93d7deb22e2c8f253749d243772d81d9d7e6c0749dd06b52f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable hosting and employing UTM parameters, strongly suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier output further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=my+hero+academia+season+3+episode+1+dubbed PDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613420f2df21d---28049948491.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/paritose.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/lowuxofediguviku.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/17981011492.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/56872088120.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/kufedexoregupeja.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/nunikija.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/kobumimigixadu.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/36392937903.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/24875028978.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/petaloniwoli.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/15356714921.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/66191392638.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/78134918937.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/lunifapidokuzekiwunene.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/lusoropelujalupiva.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_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 11208 bytes
SHA-256: 761aad43241e5b8628b895d856341efebc9ab3fe4db9bc052c782ef726338b50
font_01_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 16084 bytes
SHA-256: 96dc255d15dc9236c16119e839409be9bc8d1a2b2e83dd59dbd0082e6f57af4c
font_02_sfnt_off00013875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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