Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fc1976e0aaa201…

MALICIOUS

PDF

73.5 KB Created: 2021-03-31 19:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c3ce10c7118c8619dc35e315e29b81ee SHA-1: ed0b548686da154e8521069ac71caa07e6ae58ec SHA-256: f6fc1976e0aaa201737b9d6b000dd2a14c98f08d54d4d3a33dc1e048a2a95860
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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
  • 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.
  • 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://xajibur.ru/wix?keyword=igneous+rocks+worksheet+%25232+answers PDF link annotation
    • https://mawajajapok.weebly.com/uploads/1/3/4/3/134353668/fidumiwimab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379606/normal_6033cb661b886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_5fe8980310b90.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/mogudozevameb.pdfIn PDF document text
    • http://sandiego-podcasts.com/food_safe_temperature_celsiusbawuk.pdfIn PDF document text
    • http://apkweb.net/how_much_are_kangen_water_filtersaiysh.pdfIn PDF document text
    • https://jixivegeparimes.weebly.com/uploads/1/3/4/7/134749144/6097532394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_6016213ac9f90.pdfIn PDF document text
    • http://taptopbot.com/oster_countertop_toaster_oven_with_air_fryer_black_model_tssttvmaf1ayw8r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_6025e18c66ece.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393486/normal_5ff40b844b853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418556/normal_6010022450519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_6045fd34a5ffb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lupebesu/best_real_analysis_online_course.pdfIn PDF document text
    • http://taperimogitunal.epizy.com/clinical_pharmacy_and_therapeutics_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/realtek_hd_audio_manager_windows_10_headphones_not_working.pdfIn PDF document text
    • http://zunasolaxugi.epizy.com/apologetics_101.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/71237058574.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 4912 bytes
SHA-256: e5eeee0a2f72752020e10b37d5795443ed9be4d5956bf943443732a706a39f99
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 10308 bytes
SHA-256: dc65b33ce99408a510afe53d0906ba60923acdd0d512389fdeb926c454f17777

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