Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd3b609e5be8e09…

MALICIOUS

PDF

66.0 KB Created: 2021-01-03 05:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d64f8cb5e92c3383d95106d0cc533dda SHA-1: d298e0a33871e7283546e629821b3d1bc4f40da4 SHA-256: dfd3b609e5be8e09f4dbee4297cb1e518245b4544b696afb3d06cee9f9f11f92
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://traffset.ru/aws?utm_term=blippo+black+poster+std+font+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451941/normal_5feba856934af.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/jjdihih/animal_restaurant_game_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_5fea34574b392.pdfIn PDF document text
    • https://jalizirut.weebly.com/uploads/1/3/5/3/135308553/73d672.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e630127a-f2d6-4c0a-96db-eeff7df53fde/1984_chapter_1_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ff14da-2477-4818-b67b-3d0b8d5a81d7/10118179095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a1d701-269f-439a-9670-f067b05c0f03/the_combustion_of_ammonia_produces_no_and_water.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/nekevexulevefaragonuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aefcdf0-9584-4979-83a7-a2f1d9a40f62/87689365880.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/phase_constant_of_rectangular_waveguide.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/amandeep_singh_songs.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_off0000c667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC667 5404 bytes
SHA-256: 15bf1f97eaacd9dfa6406c95c16bee96ea6edb878f7cf240327a4efb17ea4bb4
font_01_sfnt_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 10208 bytes
SHA-256: d366ced1e95ff54583388c692d4f7aa846245c4d08b3b5de1da6a0f49b87cb00