Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c81e546087499c…

MALICIOUS

PDF

85.9 KB Created: 2021-04-08 23:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: de90096941d0c88efa58d0506e6931f7 SHA-1: 6c599df5a9cfe184b0be3d14827c0fbcd97515ed SHA-256: 09c81e546087499c7576376ebb5453cbefba86e18966011c1be5d7fd41bd6455
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to connecting a device, likely a lure to entice users to click the malicious link.

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://resalured.ru/strik?utm_term=how+to+connect+plantronics+backbeat+pro+2 PDF link annotation
    • https://cdn.sqhk.co/nupepewomaxu/ifAgjia/realidades_2_2b-_8_crossword_answers.pdfIn PDF document text
    • http://damalakin.22web.org/apa_referencing_guide_book_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5fe3e3bf67afd.pdfIn PDF document text
    • https://cdn.sqhk.co/fofibexogifu/apjbiic/factual_data_credit_report_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_605d4c9be0d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_6024cac8c25ea.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatapegil/XNMsFdL/26517547995.pdfIn PDF document text
    • https://manoduxasef.weebly.com/uploads/1/3/4/0/134041035/3552607.pdfIn PDF document text
    • https://nivumumati.weebly.com/uploads/1/3/4/7/134703955/regitalet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474220/normal_5ffa5b1c46685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_606b9237691a4.pdfIn PDF document text
    • https://jumofawulagap.weebly.com/uploads/1/3/4/4/134486933/7037634.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://uploads.strikinglycdn.com/files/d77a7702-516c-404a-88a0-9dccf1f7fd5c/burning_wheel_gold_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/kenmore_coldspot_change_light_bulb.pdfIn PDF document text
    • http://rakulewozagax.rf.gd/create_subreport_in_crystal_report_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f2bad80-7c0f-404e-ac4a-ce7496ed570a/8553923173.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/freestyle_libre_14_day_sensor_adhesion_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/how_to_bluetooth_jbl_eon_615.pdfIn PDF document text
    • http://kunerev.epizy.com/775933827.pdfIn PDF document text
    • http://lutuvukul.epizy.com/34114247022.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_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 5104 bytes
SHA-256: 72b2bfc59229883736992d889d89028c1e1459c8e12f66f502819c47ef7c8d5c
font_01_sfnt_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 11140 bytes
SHA-256: 9c01809b2a64bc178c941a843f65f24be8d4f4b5aae906f6a5e368ea7fb1630e
font_02_sfnt_off00013c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C21 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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