Malicious PDF — malware analysis report

Static analysis result for SHA-256 69164a40d859d807…

MALICIOUS

PDF

94.1 KB Created: 2021-03-25 12:35:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1a8b9679a8d3c95add428ab98075e4c0 SHA-1: 202392ed50dac58e5a3056518408eac789fda86a SHA-256: 69164a40d859d8070030fe9317c927210f5c51ccc112061deede5df6f7e4433e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a malicious payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ponafet.ru/123?utm_term=arrayed+waveguide+gratings+dana+seyringer PDF link annotation
    • https://vewuwoxefi.weebly.com/uploads/1/3/1/3/131379256/tulura.pdfIn PDF document text
    • http://rezubodojel.medianewsonline.com/the_cambridge_dictionary_of_christian_theology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367279/normal_5ffc54f3bf57c.pdfIn PDF document text
    • https://puwawegolawibot.weebly.com/uploads/1/3/2/6/132682739/gusirovasunoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_604bc0db294ff.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/79xx_voltage_regulator_datasheet.pdfIn PDF document text
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/rokozizesoxajuv-gezedusizidid-vikazomopejasir-netowaxoposi.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/93956197725.pdfIn PDF document text
    • http://magic-spring.com/dynamixel_ax-_12a_cadanun1.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/UFXgefB/spark_chess_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lojegalivo/CichjjB/84442333610.pdfIn PDF document text
    • http://blockingscenery.com/watch_dogs_2_ps4_save_data51rhr.pdfIn PDF document text
    • http://larts.digital/zuvoxasitomorelobekijod5r0u2.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/vigevot/xazidukepeworakepu.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/lirajijoxi.pdfIn PDF document text
    • http://lawesiwewif.onlinewebshop.net/xiwekadufakef.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/how_many_carbs_in_kfc_double_down.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_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 4976 bytes
SHA-256: 4a1abb70348bdac6e2892461173c4a10fbea00bbffa10438a70462030d2a9305
font_01_sfnt_off000130ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130ED 12448 bytes
SHA-256: ca595e7035c1f40fdb66ea3d17742f0d29397d7cdfe0e1627f29e9c667f054c5
font_02_sfnt_off00015b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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