Malicious PDF — malware analysis report

Static analysis result for SHA-256 7313f40d9ba7339a…

MALICIOUS

PDF

86.1 KB Created: 2021-10-06 03:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 92e2a7b40aebd18d4ba9844f49b61042 SHA-1: f94a5ffb3acea372493d0b43d83b5616439c3fb8 SHA-256: 7313f40d9ba7339a3ac23a43a245a1bb8372f8f741b6d50b14044287b19d25b9
126 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. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that these links are part of a scheme to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://crysiq.ru/uplcv?utm_term=special+test+for+low+back+pain+pdf PDF link annotation
    • http://jnnycc.org/userfiles/file/16186216444.pdfIn PDF document text
    • http://kaies.net/upfiles/file/bikujawapuzidi.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/39344258983.pdfIn PDF document text
    • http://fencefactoryny.com/userfiles/file/59352800772.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/89695815577.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/vewabitijadowanaveze.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/78842664440.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/tevamorajeweraruwomovima.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/dufalokoxoxano.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109242329255723.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/87326087834.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/nawagitokapirazoluf.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/naxivavodikolesofa.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/pamabebigobu.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/11699141598.pdfIn PDF document text
    • https://12waktu.com/contents/files/83227776794.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/82120287354.pdfIn PDF document text
    • http://mutitar.com/user_img/files/9257759338.pdfIn PDF document text
    • http://jonme.net/ckupload/files/zajugidila.pdfIn PDF document text
    • http://artospace.com/pics/file/58274998625.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/21277969020.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/sojid.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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 11004 bytes
SHA-256: 165b697096ebd6c071083d6a688fd5495eabba2272951d8c7837a4a543244811
font_01_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 20552 bytes
SHA-256: 46b7e5701f831fec023aac2e502165cd750ae3e0c00818c04bcccacb6d3e3dd8
font_02_sfnt_off00013314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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