Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8fb6aa28acae87…

MALICIOUS

PDF

79.2 KB Created: 2021-01-09 23:14:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1bd84fae34d0b723fee12b87f3a78fff SHA-1: 98e1f353522741816733dabae6f251395bb3a482 SHA-256: 7d8fb6aa28acae8726179369b4acd3321c46fe9c1b95afe984bd15da9a4aec04
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The embedded URLs and the PDF structure suggest an attempt to manipulate search engine results or redirect users to malicious content. Although no scripts were explicitly extracted, the PDF's nature and the numerous external links point towards a phishing or SEO-based malicious campaign.

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://traffnew.ru/aws?utm_term=latex+cv+template+graduate+student PDF link annotation
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/4264123.pdfIn PDF document text
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/f7f5d155.pdfIn PDF document text
    • https://bageribo.weebly.com/uploads/1/3/4/5/134592059/jukuwegew.pdfIn PDF document text
    • https://jitojadafolad.weebly.com/uploads/1/3/4/4/134404030/e0c4d37e50a7.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/gdrggii/free_slot_machines_play_now.pdfIn PDF document text
    • https://pamoxoxose.weebly.com/uploads/1/3/4/6/134656592/makaribat-dilebifezi-jebegin-xamibunofuxubun.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/6670556.pdfIn PDF document text
    • https://rizenorugeworo.weebly.com/uploads/1/3/4/3/134379336/2655186.pdfIn PDF document text
    • https://dudulisatosix.weebly.com/uploads/1/3/1/6/131637211/9450237.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/zedudo/tepevibukaratosusajomutir.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/psychological_testing_anastasi_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/free_printable_monthly_household_expense_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/annie_oakley_quotes_aim_high.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/nowuteboresam.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/12295207932.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 5460 bytes
SHA-256: 4da06fe961b9f1068879600b3d68122b7a2883ec56a06d532f7bfc14e965b05b
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 10252 bytes
SHA-256: 7e7e6c6e3e580eafc5647bca62453964504e82888ca99ee75b38053a6598b985
font_02_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1

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