Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bf3f2b55a06ae2…

MALICIOUS

PDF

84.4 KB Created: 2021-04-01 06:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 18cef9ef6731997220beedb0f4d5729d SHA-1: dd1af95a15b21faa69c767f5aa809e64e862cad6 SHA-256: d4bf3f2b55a06ae2f76389786ef9a4229fbdf07c993920a0afa453e4f1ef6ecb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/123?utm_term=datasheet4u+share+search PDF link annotation
    • https://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/nogobawilipa-gimel-lufex.pdfIn PDF document text
    • https://pajopujo.weebly.com/uploads/1/3/4/3/134305169/jovabadaw.pdfIn PDF document text
    • http://cardio-active.site/dell_optiplex_gx620_service_manualonxm1.pdfIn PDF document text
    • http://nesobaka3.xyz/5433642188usdor.pdfIn PDF document text
    • http://womenit.space/online_marathi_converterpig0f.pdfIn PDF document text
    • http://fkpravo.ru/how_to_do_anova_in_excel_20078muns.pdfIn PDF document text
    • http://voirlo.xyz/18479957810a32sq.pdfIn PDF document text
    • http://alkim.xyz/zipuwav9m2hi.pdfIn PDF document text
    • http://nesobaka9.xyz/sidewajerewipekosoh5dpz.pdfIn PDF document text
    • http://busurman.space/27477115277vjlev.pdfIn PDF document text
    • http://umniashka.ru/sedatopagenimupurufuzoxesbnsjb.pdfIn PDF document text
    • http://sujegudapapew.iblogger.org/adverbs_of_frequency_worksheet.pdfIn PDF document text
    • https://gozaperirij.weebly.com/uploads/1/3/1/1/131163841/xuliredufukib.pdfIn PDF document text
    • https://tolaguse.weebly.com/uploads/1/3/0/8/130814280/vogifu_xerifivozaw.pdfIn PDF document text
    • http://atlas-copco.su/xowumojiruzovomenawolitycxq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibirosomuxir.epizy.com/tiwuponosotumasovut.pdfIn PDF document text
    • http://veramok.rf.gd/shukran_ya_rabbi_audio.pdfIn PDF document text
    • http://pipomutazujem.rf.gd/what_to_eat_vegetarian_to_lose_weight.pdfIn PDF document text
    • https://49f3a523-2ddb-4f17-a073-729d67a362fa.filesusr.com/ugd/18c683_ba232f0dbd22488ea7cb287043c39db2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d6b40b4-930f-400c-8eba-90559abbb909/50th_law_review.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_ade8f9392e8c4a7fa42b0d3523f72dff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f488e965-33d6-4088-b23b-00e2525d0f70/nikabogamirifi.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_1f6e11aa45a343ec9ed93f22d1755aef.pdf?index=trueIn PDF document text
    • http://rerumixididepu.rf.gd/8506186638.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_e4ad7f83f29e46029dd7fc5a1e624b1a.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 7540 bytes
SHA-256: 9f91080bd3944c875d32fc775b5cb6dc81134f7b18f3fcabb5f571239efaa3c7
font_01_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 4944 bytes
SHA-256: 8edd4b98dc2d54ce062f128c1bb8578a4c8f7d9abe50291df41bb4308f4c700a
font_02_sfnt_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 12172 bytes
SHA-256: f559bfe50b9816b3f9813c43324d4d2db37de85820d51c9cf4c87988a6f413fd

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