Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d79e3ca3d063155…

MALICIOUS

PDF

80.3 KB Created: 2021-02-13 04:10:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bc0c1b3e9decb8fb2291a5a2f64e9c75 SHA-1: 3bdc6e2db77a6a634c1c78ecafd37b218274208d SHA-256: 0d79e3ca3d06315559e21add4f7b72cdd5b5c2bbdf9903c3f53224a60cf8e300
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or SEO manipulation scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=spruce+knob+lake+campground+sites PDF link annotation
    • https://cdn.sqhk.co/zojixemem/YigWNjg/3d_driving_class_game_online_play.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/ramunigaraburazudam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_6026613b81225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477910/normal_60270ea6774b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451545/normal_6015fe363249a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_60258c39ed006.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/1276821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413696/normal_5ffce2eb15492.pdfIn PDF document text
    • https://foritedaxezakul.weebly.com/uploads/1/3/4/0/134016863/a3abf4e457.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/bfdVgeB/55553269569.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365539/normal_5ff2f7dcc2313.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/duUghjg/64855380198.pdfIn PDF document text
    • https://cdn.sqhk.co/lepemafe/LfhfSgO/votoguxifobabapidosisi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fcd64e9e79f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_601cb5175f715.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393353/normal_5ffe03be94bbd.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/pivetuzadujo/contoh_descriptive_text.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/brothers_in_arm_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/bigogoruruxetesepabugovi.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/graphs_of_exponential_functions_worksheet_answers.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000116d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x116D6 18276 bytes
SHA-256: fb79cd21377d212e62be36db361a1f234f6d706d66672ffb39d7ed69d3a3dfbe
font_00_sfnt_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 5700 bytes
SHA-256: 5794b461cce93bb6cf4544aa035f90893be601e174032867f8d7156d2ec1793c
font_01_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 10428 bytes
SHA-256: ec4769fd4c56dc8a9d838fad86e0e2b131e46535805e4e3318638e950de20563

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