Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf8b5183820eec7…

MALICIOUS

PDF

74.8 KB Created: 2021-03-17 17:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: be7153b7d025f213eba93b16249e7947 SHA-1: ad100935b8e6f5be16f29fc0a7c0403d97f63e04 SHA-256: cdf8b5183820eec73bb72dde36e460b3fb28c5e2c654d225234b34df1eb875bf
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs pointing to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of links suggests the primary goal is to redirect the user to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=fox+in+spanish+pronunciation In PDF document text
    • http://tejidirexe.mywebcommunity.org/examination_for_the_certificate_of_proficiency_in_english.pdfIn PDF document text
    • https://ponivigaxuk.weebly.com/uploads/1/3/5/3/135313456/4000669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417030/normal_601a3662af124.pdfIn PDF document text
    • https://nidedijuba.weebly.com/uploads/1/3/0/8/130814831/2a5474d057.pdfIn PDF document text
    • https://kimilofu.weebly.com/uploads/1/3/0/8/130873947/ritanu-nimedutol.pdfIn PDF document text
    • https://rukepeninosiwul.weebly.com/uploads/1/3/1/4/131406291/mofatevuzamuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5fe7733d5c6c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373987/normal_5ffe91c64b28d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_5fe8c84ca7a88.pdfIn PDF document text
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/1930842.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/19122301419.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/6mE2jdF/flippy_race_gameplay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460963/normal_60069d4e1b98c.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/9299700.pdfIn PDF document text
    • https://cdn.sqhk.co/matezafun/fYR5dms/strawberry_shortcake_sweet_shop_mod.pdfIn PDF document text
    • https://sanajupa.weebly.com/uploads/1/3/1/4/131406847/6542101.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/ggfJ69K/melavuwumavi.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/iicohfa/brief_marketing_plan_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/446e45b3-4d2f-4d85-a7be-c7693cb17362/23115413578.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/13930345694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94fabaa-f8a1-4843-945b-8348d83684e6/honda_pressure_washer_engine_oil_capacity.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_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 5012 bytes
SHA-256: 5da8fd46aa8fb1f2c9af05c6a23cf61527205b811bffa6294f042fc8f0e467cb
font_01_sfnt_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 12128 bytes
SHA-256: ce74eba992ac59c70e0758d67d53d195ede7420a1ee08de77324e3c166af207a

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