Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fd52e26b3f9947…

MALICIOUS

PDF

105.3 KB Created: 2021-03-16 19:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f16bb6cf686c80f0ccf3b3a89f8c3747 SHA-1: 28c0ccbefa5e434952f176df987ff3182057da16 SHA-256: a4fd52e26b3f9947fb82357d8841242e2258bb2a2ce9ef9fe39db4612389e94b
76 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains an embedded URL that redirects to a malicious domain, identified by the 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains keywords suggesting a lure related to 'Elric of Melnibone' and mentions 'wkhtmltopdf', indicating it's likely a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/wix?keyword=elric+of+melnibone+pdf PDF link annotation
    • http://gedadekenoz.mywebcommunity.org/72449199619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_604d222204cf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458615/normal_5febb6c1da905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_601e264f32ce4.pdfIn PDF document text
    • http://tatajosak.22web.org/employment_application_form._docx.pdfIn PDF document text
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/mudemubigewab.pdfIn PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/nutizire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483072/normal_600e7bcb3a231.pdfIn PDF document text
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/a96b59eed19dc.pdfIn PDF document text
    • http://wixujikubipom.mygamesonline.org/basic_math_formulas_for_asvab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448339/normal_5fc5e5e4711f1.pdfIn PDF document text
    • https://demenuxukuxit.weebly.com/uploads/1/3/1/4/131438289/ronabuminavo.pdfIn PDF document text
    • http://pobumur.iblogger.org/laceration_repair_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wixatax/lukedewasuzodijuxiv.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/44636166687.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/calories_in_arbys_beef_gyro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f7cb6b-f3e0-4a0f-86df-d5bb46034dea/a_dolls_house_summary_act_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e6ae58-6c3c-4555-a3aa-2501a6daed78/weziwuvatefowulufepep.pdfIn PDF document text
    • http://wegudewabeko.rf.gd/compaq_presario_cq57_drivers_for_windows_7_professional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aab0504-9ade-4a4a-8a18-55f940bd08b6/96565394077.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/pafolemimunebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d357586f-3a67-4bed-950d-e52d9c51f068/wakiludiziginaxofunega.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15143 4716 bytes
SHA-256: d057e488f0f5fe6d536d94e308c95070477db634bd014ded611090c07ccf88ef
font_01_sfnt_off0001610d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1610D 12052 bytes
SHA-256: d4ef8f76ba799d2619db8c99d73f0175f6ed1faa9714a0164b808fedddd6659b
font_02_sfnt_off00018908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18908 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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