Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cd3d74728d8ecb…

MALICIOUS

PDF

77.7 KB Created: 2021-03-24 06:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 011eb78dd02829d4030bfe7d25ebed40 SHA-1: ced7666ab421e7b4259a73aaaae20ad704620816 SHA-256: 27cd3d74728d8ecbf288c88b8a5587795e3b2776d7d070188ff28f508f654bea
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual content that would explain the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wb?keyword=how%20to%20cook%20lamb%20ribs%20slow%20cooker PDF link annotation
    • http://fatimuze.22web.org/maple_software_guide.pdfIn PDF document text
    • http://lesorurudefige.iblogger.org/advertisement_analysis_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/3bjcicC/nuzanufifojigadinikum.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/ePOzCmR/samsung_notes_backup.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/4YjaFif/destiny_child_album_download.pdfIn PDF document text
    • http://tuzazigigub.iblogger.org/8._2_angle_bisectors_of_triangles.pdfIn PDF document text
    • http://sidegut.22web.org/vaxeloz.pdfIn PDF document text
    • https://cdn.sqhk.co/vizefejij/icjesif/california_ab540_form.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuwaxisiw/cfqD4gg/262449537.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/Z3haexW/5172877958.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/luxelula/plan_nico_de_cuentas_bajo_niif_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57634a8e-8187-4870-945f-155658810d66/king_kutter_finish_mower_blade_bolts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1349ca-0d3b-45c8-a139-361072fa9417/geometry_basics_worksheet_answers_gina_wilson.pdfIn PDF document text
    • http://rekujub.rf.gd/bid_bond_sample.pdfIn PDF document text
    • http://fewakemuwu.epizy.com/94237343793.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/5785992274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7129802-3808-4702-b9c2-af88c0fed8df/56550269419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12434c85-657f-4d00-858e-4153041d80aa/food_safety_news_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/behringer_x_air_x18_digital_mixer_manual.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_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 5200 bytes
SHA-256: 273671e17f1284970ff249b46264ed41a7afbedd67e62a237eb37121521b30e2
font_01_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 10976 bytes
SHA-256: fe74e35cdc26ca3df6ea87d3d6d94389f86b5edbdbbf14be5bf5dacc73cfc6bc

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