Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fae23c63da0cb4…

MALICIOUS

PDF

75.3 KB Created: 2021-03-19 10:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b08c0696129f596373a0d81cf44cf94e SHA-1: e57706652f89557ce4f86dc431bb8a259255cbcf SHA-256: 37fae23c63da0cb410c2cad69bb95557fe176b43c12b0d17fa930b661f2b7804
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as Pdf.Phishing.Trojan. It functions as a link farm, embedding numerous URLs that point to other PDF files hosted on disposable domains, likely to obscure the ultimate malicious destination. The document body, though heavily corrupted, suggests a lure related to mathematical exercises, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/award?keyword=antrenmanlarla+matematik+2+%25C3%25A7%25C3%25B6z%25C3%25BCml%25C3%25BC+cevaplar%25C4%25B1+pdf PDF link annotation
    • https://duniterete.weebly.com/uploads/1/3/4/6/134690204/9819848.pdfIn PDF document text
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/degurosoxel.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/cgcgfjg/invasion_of_the_body_snatchers_pods.pdfIn PDF document text
    • http://differencecheats.net/nisemufigjt3sm.pdfIn PDF document text
    • http://italywow.info/datepicker_date_format_with_time633b6.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/Khcogev/rezajubipoxetidenaf.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/ejcifjc/efootball_pes_2021_ps4_store.pdfIn PDF document text
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/8104801.pdfIn PDF document text
    • https://cdn.sqhk.co/kevejonob/haPgjiO/vowudezi.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/a6Xifgf/bubble_bird_rescue_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/4Rhjhgf/living_room_furniture_sets_clearance.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/ihft9om/pilokekolavon.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/eClEPuB/73653556864.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/jj7dWgg/nosigukebomufufiparup.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/Vibjjgl/best_offline_personal_assistant_app_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_7b56ac4037854caea5e4e5c2dea880f7.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_b1329267be1e4946913194262f468ba7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 5892 bytes
SHA-256: 44f47ff4d022f011ba04f4e0a218b9b0eff4aa87f6a35ca4f3e2369a85995e7b
font_01_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 10728 bytes
SHA-256: 8db220ed2c1b3aa6ff7736785e9f65c3dbe899215d2bac91fbff37fc94549d43

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