Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cb95227e7576b5…

MALICIOUS

PDF

70.1 KB Created: 2021-01-29 00:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 11611243570276f63fcc446b482d14f5 SHA-1: 373d235ebec1cbaaf376d42de6a34df6237be323 SHA-256: 38cb95227e7576b559e73dfbcba1ca04eedb00ed67b80dbbcb71462e141be55d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://bologen.ru/123?utm_term=the+second+star+to+the+right+sheet+music', is directly associated with the document's apparent theme. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=the+second+star+to+the+right+sheet+music PDF link annotation
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/lesiwamalijo.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/jagijdN/domino_smash_3d_download.pdfIn PDF document text
    • https://pirogitemaxo.weebly.com/uploads/1/3/1/0/131070842/mulogirawi.pdfIn PDF document text
    • https://zawibovime.weebly.com/uploads/1/3/2/6/132681883/af5a8f1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491436/normal_5fe1c0e8200ed.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/gchdW5R/racing_traffic_tour_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikewe/jdJgfhj/76855586482.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477629/normal_5ffbb31ebd34b.pdfIn PDF document text
    • https://cdn.sqhk.co/jotoselu/ehaIpij/60113400335.pdfIn PDF document text
    • https://cdn.sqhk.co/xinoxoxojib/fYzNjdN/35922439102.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/hKhd5jg/satidugemaguv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_5fe6209353601.pdfIn PDF document text
    • https://vexokisu.weebly.com/uploads/1/3/4/7/134717498/jidasame.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/5hiAhdd/subway_surfers_on_computer_unblocked_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_5fd32d0485640.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/tuxutedi/nomafarufexo.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/bosch_microwave_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/pickup_cutout_photo_editor_app.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/43562285614.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/58075991430.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/buzz_break_apk_all_version.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/infantile_spasms_treatment_guidelines.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_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 5272 bytes
SHA-256: 3f45c32391046b26fc3244793d62af1da176ca0f114a8d0c7eba3e397ff500ed
font_01_sfnt_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 10372 bytes
SHA-256: 2a2b7b0ebfb25706ff36cd962557837c0015478fa714b51ccb745e9aff6a32e7

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