Malicious PDF — malware analysis report

Static analysis result for SHA-256 b522fa83c631998c…

MALICIOUS

PDF

94.9 KB Created: 2021-03-03 00:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7b071054ae59fcb810991036cde707e1 SHA-1: 952a78cf60d727f4d9e3f9ce94d25b910cf272ab SHA-256: b522fa83c631998cba9624a3b9f2cb0479f6bc725277cd141d3efa3e74d1e280
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to game downloads, indicating a lure to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=scripture+gems+3+nephi+17-19 PDF link annotation
    • https://cdn.sqhk.co/jaziwuke/gicjggh/food_truck_restaurant_kitchen_chef_cooking_game_download.pdfIn PDF document text
    • http://lenugaguv.medianewsonline.com/18009624764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_6039181150f5d.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/aCm5ghv/motor_sims_2_download_mac_free_full_version.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/duwagulafabijisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5fd2ec445de57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373749/normal_5feb872931006.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/jowilowefatej.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/suwadukijeze-jijowikude.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404524/normal_5fdea086ebdec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449419/normal_5ff22984d181a.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/kufazete/how_to_be_a_cashier_at_walmart.pdfIn PDF document text
    • http://bememikat.onlinewebshop.net/how_to_use_jvc_camcorder_as_webcam.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_off000138bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BF 5692 bytes
SHA-256: a2d5a114d4b57e08ba2207bc169c6e461b1a5500ddd8a251894e17e1b8e63091
font_01_sfnt_off00014c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C13 10160 bytes
SHA-256: 81228edb6212e22c1bb86a1e6924a5be2f55ee4d33067a3417a6f0767d9f5df7

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