Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc75faa7ac442e7a…

MALICIOUS

PDF

78.6 KB Created: 2021-03-17 07:33:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 67bf35e90a8b3bfd13eb6f1608fe1d59 SHA-1: 0571aa5b04bfbaeb298eb28feb4a8368a4622f65 SHA-256: fc75faa7ac442e7a81d324ad96044b81808c0bb002cd6f9fac91aefed5930737
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs pointing to potentially malicious domains. The PDF's structure and embedded links suggest it's part of a link farm designed to redirect users to malicious content, likely for phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/wix?keyword=phoenix+fire+tactical+worksheet PDF link annotation
    • https://cdn.sqhk.co/buganixezu/jDH11gj/skydiving_age_limit_in_georgia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_60343ad800bce.pdfIn PDF document text
    • https://wozukaziximuru.weebly.com/uploads/1/3/4/5/134587045/bokomekojume.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/hdEgcgi/dusife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464527/normal_600d2ab55db29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_60300d0874412.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/h13mAih/6201072201.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470412/normal_5fcfa55e37364.pdfIn PDF document text
    • https://cdn.sqhk.co/vinusubat/YC7nCXF/at_t_u_verse_internet_plan_comparison.pdfIn PDF document text
    • https://korumarivaz.weebly.com/uploads/1/3/4/5/134506991/faxuvog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417990/normal_5fddd2fcce28f.pdfIn PDF document text
    • https://xumulevaz.weebly.com/uploads/1/3/5/3/135348617/bipuwat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443799/normal_603deec9128bb.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/fhcrI0a/calculate_percentage_change_in_excel_chart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385021/normal_5fe09259566c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_4cb6761ac51542a1a0e950687e7b02d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gomaxod/instagram_story_covers_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/pdfzorro_edit-_files_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/netherlands_train_map_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/mudozatasukikepiku.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/good_night_my_love_images.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_3e9987f3dc9f4881a7771bca3927a563.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_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 5196 bytes
SHA-256: bf664a77cef085ac322a9937406102ff23c9397a83f93756d2f85c46fd51c327
font_01_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 10660 bytes
SHA-256: 018e49b115eeecf35557663226a54e8f1537f227f1f9c50422f66988f58adb78

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