Malicious PDF — malware analysis report

Static analysis result for SHA-256 64942df80ae8288b…

MALICIOUS

PDF

72.8 KB Created: 2021-04-30 03:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bce666c38efd7b081d2ef40fe4b8c342 SHA-1: 4cf3bb5e2f0d3cc17d51e320f5d9092bcb40068b SHA-256: 64942df80ae8288b394d0a7f7b0b4418cb44805b4945e237dec5218d2b9d5d1f
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML classification and ClamAV, as malicious and phishing-related. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or scam campaign. The document body is heavily obfuscated, but the presence of external URIs and the 'SE_CALLBACK_LURE' heuristic suggest a social engineering attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/strik?utm_term=asm+metals+handbook+volume+21+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453344/normal_5fd12957277cf.pdfIn PDF document text
    • https://nonadokemiraf.weebly.com/uploads/1/3/0/9/130969568/c3c61e9bcfda2.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/3LLicid/60128884548.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5ff97afda3549.pdfIn PDF document text
    • http://ragixanomus.iblogger.org/nakop.pdfIn PDF document text
    • http://guvetosufawi.22web.org/46901667116.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/1682ed04f.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/igjgjje/kodasu.pdfIn PDF document text
    • https://fogasofimoxor.weebly.com/uploads/1/3/1/0/131071298/7983508.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/pyihion/vote_for_me_posters_student_council_vice_president.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_538c64d90fdb463c9d3d9b205d0f8d0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f655c9d6-428f-4404-af18-e888ab0dbbcd/how_to_build_a_workout_training_program.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_2e2d6b88e92e4d36af1927525f8e5fcb.pdf?index=trueIn PDF document text
    • http://ropugefax.epizy.com/93422137109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ca1314-91eb-4fb4-a76a-701dd56bfe1b/how_to_register_beetel_cordless_phone_to_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d987aab9-3613-47f9-8a16-0348d65a8876/iso_27001_espaol_2017.pdfIn PDF document text
    • http://jujovotusenugo.epizy.com/all_about_me_newspaper_template.pdfIn PDF document text
    • http://fuzamerivamowo.epizy.com/revenue_management_hotel.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_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 5620 bytes
SHA-256: ecedee73a7a6619ebbde2cd05e3dc85b717be96fc029c8ad51d4374a230bd981
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 11536 bytes
SHA-256: 97d931bd5c7adf6e746f21549510c2c3855d99517c17d63c5e9443534f1066a5

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