Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc8bee6b21e6a12…

MALICIOUS

PDF

72.4 KB Created: 2021-01-03 17:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ff011629cbf4df6690e44d477b035084 SHA-1: bd09f9cd130d84f1bf968cb3272ac4ecdbcd1d20 SHA-256: 4bc8bee6b21e6a129413b972ada49761dcef8189695a49323104e9869916e433
156 Risk Score

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffine.ru/123?utm_term=elsword+optimus+pve+guide PDF link annotation
    • https://cdn.sqhk.co/bowawugafux/hjUyZgc/move_whatsapp_from_ios_to_android_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453579/normal_5fab2dc37b4a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5fd3cc5b2ad36.pdfIn PDF document text
    • https://simisidexibasu.weebly.com/uploads/1/3/4/5/134502995/podutabulu.pdfIn PDF document text
    • https://cdn.sqhk.co/fabukujeb/VbteT1b/the_impossible_quiz_book_chapter_2_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/sirazisiluz/VEmfhac/surviv._io_wiki_changelog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_5fa729f61e823.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/babetafaperaxov/66582359118.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/fiba_basketball_scoresheet_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/latest_yahoo_messenger_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/blossoms_of_the_savannah_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/baligutanuju.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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 5176 bytes
SHA-256: 3da53458911c5abb270a75b1a3ec056936fda2edc6b7bde6770c68b39ec19f22
font_01_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 10520 bytes
SHA-256: 59b7e18c9a34271b44f09ed3cff77c271f9bf52ccae86cefbbe1cafeb3f1e6af