Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35d9dc35c171240…

MALICIOUS

PDF

79.8 KB Created: 2021-03-27 21:28:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fd8fdb93896d7e26888ef2daa62746f2 SHA-1: 7379dfd2afdc7d7500d3431490e48f17609dfba9 SHA-256: a35d9dc35c1712405c0f889170c6b4349b950e300dbf241699b0b96efed51fac
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://xajibur.ru/award?keyword=ordo+diptera+pdf PDF link annotation
    • https://nazasakodaz.weebly.com/uploads/1/3/4/6/134667833/6953137.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/fPtOgij/lowuzasejobale.pdfIn PDF document text
    • http://gujotimizuluxos.iblogger.org/wenifewoxabagobajexeju.pdfIn PDF document text
    • https://noloxuxema.weebly.com/uploads/1/3/1/4/131453633/nosezifeda_woxab_zufumebexan_lubuwijefetego.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/RBjPZTm/cessna_210d_parts_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/dOFgejc/17131416574.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/97f32b51-75db-4b27-acfe-21d56e27cc2b/72147821858.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/pisirunoji.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/24643330706.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/program_evaluation_report_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/wezapamabebewajobeperabar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfebefd7-0f41-4586-b275-ae2ee47c9cba/68429311517.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/1991_polaris_trail_boss_250_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395b5c5e-7d9b-4e58-90d5-694688eedbe1/xideruzasisetezi.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/code_128_excel_font.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/easy_ukulele_chord_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/high_platform_bed_frame_with_storage.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/infosys_corporate_governance_report_2018.pdfIn PDF document text
    • http://bukuzagalu.rf.gd/chicago_style_citation_bibliography_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ded366-8526-4e97-b903-fd4704265f81/pioneer_avh-x1500dvd_android.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_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 4852 bytes
SHA-256: 4e8cbad0b8473e9ccef368e54cd1ca745c8fbd6882ecbd7551a5415fa10d4d96
font_01_sfnt_off00010e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0A 10568 bytes
SHA-256: 02c8a0c8478e7dec934355bb3b352ab176d451c26429590eafffa877844a1735

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