Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64497650802fe3c…

MALICIOUS

PDF

74.4 KB Created: 2020-12-21 18:47:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cb3a4b613abad85e8dafe0558c08a892 SHA-1: b778b38a250d0f5289d43db9de2b8c6d68bbc12c SHA-256: b64497650802fe3cc4e67eb05b625750a2de6a6c166d5ea27b5b7190cdf602f1
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. It also features a link farm on disposable hosting, directing users to a suspicious URL. The document body, though heavily obfuscated, contains text related to 'secret codes for free data' and a 'quiz', suggesting a social engineering lure.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/strik?utm_term=secret+codes+for+free+data+on+glo PDF link annotation
    • https://jisevudes.weebly.com/uploads/1/3/4/8/134882916/97ac6b.pdfIn PDF document text
    • https://moxetutatag.weebly.com/uploads/1/3/4/2/134234950/41b10012e.pdfIn PDF document text
    • https://gonedosi.weebly.com/uploads/1/3/4/7/134730609/8599029.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/30bfad0a6af73ae.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/lanaxutodi.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/6f61c1f9-aab5-470f-90c3-39e785e641a0/impossible_quiz_2_cheats.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/codesmith_generator_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/gukivib.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/84748233694.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdfcf47f67c863bcd18c9eb/t/5fe03419a3b92b153c50778a/1608528925849/jimudojufita.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/hamburger_writing_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7fabc9b-9ac7-401d-a98f-30b08714f110/53446027000.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f16f7d0c8f249d4106bd/t/5fcf858301eaf4591e2cb216/1607435654666/mini_ninjas_xbox_360_freeboot.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/bhoomi_trivedi_songs_free.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_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 5292 bytes
SHA-256: c59ead2373752fc76759ee45007370477b52a7e4e96c030ac4823ca1e9584256
font_01_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 2116 bytes
SHA-256: 8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8
font_02_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 11124 bytes
SHA-256: a69f041b73583d831662bd70f89b0e06294e63d6814db3ec8117d29df4c96b00

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