Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dd5b6fca8ca9a7…

MALICIOUS

PDF

71.0 KB Created: 2021-01-08 22:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 017e7823d95a04d53a8f135d3db16562 SHA-1: 715def0a9187aea749726e10840f49040a85c988 SHA-256: b5dd5b6fca8ca9a79f05fb817403e33aec4cecb471e01a2cc65daef09a01d86e
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI that redirects to a suspicious domain, likely for credential harvesting or malware delivery. The PDF's structure and embedded links suggest it's part of a link farm designed to obscure the ultimate destination.

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://trafftec.ru/123?utm_term=physical+science+book+9th+grade+pdf PDF link annotation
    • https://bixowupe.weebly.com/uploads/1/3/1/4/131409305/sukepigidulumug-bivelozixeriw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450351/normal_5fc473b10fc10.pdfIn PDF document text
    • https://vijuvunido.weebly.com/uploads/1/3/0/7/130740607/lulidojawufemezifax.pdfIn PDF document text
    • https://vexivager.weebly.com/uploads/1/3/4/6/134634122/wekubupese_kilujotewifaw_dabojidigujer.pdfIn PDF document text
    • https://gokivasinu.weebly.com/uploads/1/3/4/3/134334496/satolaxusoxupikige.pdfIn PDF document text
    • https://muborite.weebly.com/uploads/1/3/4/4/134442605/aa17565cafaef.pdfIn PDF document text
    • https://dotadokox.weebly.com/uploads/1/3/4/8/134883209/7319555.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/memul/47633575209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5d3e44-a872-49cf-9a0f-6e5b1926cc55/97121435180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab5e5e4-3ee3-4bd3-ae8a-7fdd8fefdb2e/baby_lullaby_songs_go_to_sleep_1_hour.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/lego_worksheets_for_preschoolers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b5968d-36af-45e0-b851-3a28abe999dd/vugesimuxibodit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb589f20-90df-4028-9be9-9ab39aa8f7d0/xozuzumulet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1507762b-324f-4946-b30e-7bdcb71c1361/mofiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/856609e9-36e6-4a8a-919d-56b816176d63/addendum_to_lease_agreement_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023dd72a-b834-460f-ad7a-ccdca51ea2b2/see_aggression_do_aggression_summary.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_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 5880 bytes
SHA-256: 70a16b6d678d47a0cffaa22e151f80beb622b08ca0d029dd0e322085007347ff
font_01_sfnt_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 10668 bytes
SHA-256: 7cd3a021d19113561c07b5db8d4d686646284653314b3207b0ee2a474d02aa7c

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