Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e5b07fb7d3df0c…

MALICIOUS

PDF

81.2 KB Created: 2021-03-25 03:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f9f5e4bcf82fc914e67e6fa6957d5777 SHA-1: 8c12c239ce2541ecbad42c90ed2e3ad775dc9d37 SHA-256: d5e5b07fb7d3df0c9d97ffe54169ac918432f11d557d9add682bba658ed57471
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/strik?utm_term=e93839+motherboard+ram PDF link annotation
    • https://cdn.sqhk.co/goduwonon/ojbeheg/japanese_ww2_aircraft_model_kits.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/aVjEZVd/27262912236.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/yobjdF4/79064576833.pdfIn PDF document text
    • https://cdn.sqhk.co/kefaforuletu/YUpjghb/idiomatic_expressions_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/tekonunise/jhjdX1X/67551209405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roboketisi.rf.gd/nfl_playoffs_2020.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_976800637ad8457e948ea11acfcf30eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce16965-5ceb-4fb2-9a4c-a8cefcac53c7/lusunijonavab.pdfIn PDF document text
    • http://tirisesu.onlinewebshop.net/libros_gratis_caballo_de_troya_9.pdfIn PDF document text
    • http://pasifowon.atwebpages.com/my_hallelujah_chords.pdfIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_d7faf8cb6c3c49958911e8f46bc34c51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d38159-aa93-4636-b86c-f2a00baaf908/32527741977.pdfIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_5c7976ce25954fa6a55d2be5bb73eb6a.pdf?index=trueIn PDF document text
    • http://jawegoxizifiti.epizy.com/how_to_reset_kenmore_80_series_dryer.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_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 5464 bytes
SHA-256: ca115bf3f0b0eaae5c2d8ac620c7a59c7b1b385e7c89ccee4f88c14da1a8f432
font_01_sfnt_off0001126b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126B 11212 bytes
SHA-256: b04930a3376a833fa35a86fe962c9f3da75e5d07d7083025ed2b3ee1c10b13c8

Open this report in the interactive analyzer, or submit your own file for analysis.