Malicious PDF — malware analysis report

Static analysis result for SHA-256 7746a7b233d5e09d…

MALICIOUS

PDF

79.8 KB Created: 2021-01-15 00:18:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 344ac07235bfdaff6dc78cbd9c0b96c1 SHA-1: d3352fd67df6503ef73cb4288799ee91c4db3d7b SHA-256: 7746a7b233d5e09dd59c54da9c69bd88c365cef98ed929b2347cdda5e8f89cfb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs that likely lead to phishing pages or further malware downloads. Although no scripts were extracted, the presence of multiple disposable domains and UTM parameters suggests a coordinated effort to distribute malicious content.

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=watch+she%2527s+the+man+online+free PDF link annotation
    • https://site-1177566.mozfiles.com/files/1177566/how_to_get_followers_on_tiktok_faster.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_5f998a2f6fd29.pdfIn PDF document text
    • https://site-1180825.mozfiles.com/files/1180825/thoracic_surgeon_cleveland_clinic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471690/normal_5fc8c57dd4cbe.pdfIn PDF document text
    • https://site-1178186.mozfiles.com/files/1178186/ci_ch_play_cho_android_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/xoluxuroku/SmdzyjT/house_secrets_hidden_object_game.pdfIn PDF document text
    • https://site-1168029.mozfiles.com/files/1168029/the_cw_channel_number.pdfIn PDF document text
    • https://site-1172793.mozfiles.com/files/1172793/searching_movie_streaming_release_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381751/normal_5ffc8169b4e87.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/pazifetanegapu/28145279166.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/91532457696.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_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 5168 bytes
SHA-256: f8edef72242f2a7599eb5e6eb4b571987315daf31be6c72403f0ca9bfff1262b
font_01_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 11328 bytes
SHA-256: ec76a0ec19c8c7dcdd412a17e43985b8d19cfc46f7f4c8c6ba5a6980faeb2ada

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