Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f3912235bbdfd2…

MALICIOUS

PDF

112.4 KB Created: 2020-11-29 08:25:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 913b1c6a674c540bea7bfce5660a5d51 SHA-1: d88a18413acccab93fa25a5ee3cf11dab56df474 SHA-256: 40f3912235bbdfd2f6d90075bede1f8a6939d7e05b55b8ed36ffdccff2ecd11c
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 0.9995

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://traffnew.ru/123?utm_term=nice+france+population PDF link annotation
    • https://surinulijo.weebly.com/uploads/1/3/4/6/134648677/runulatuluned-vipenefetiro-xoxub.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/cbeff81b-cbe9-46f4-afca-7d5dcb9576a5/wegopuxawadebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44917dcb-094e-425c-817c-0cc5f86089e4/viwizetugem.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/fogegitatapojax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b502ac-4011-427e-827a-9546647184c6/aj_rafael_we_could_happen_ukulele_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00597ff-d922-4808-bfaf-19ba378df8c7/the_long_journey_home_cheats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db274f2f-1bdb-4e2d-9daf-9374a8ee55f7/rapevezevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09cbcaf-8020-4fcb-9bde-eff8b1a426a6/sodium_bicarbonate_valence_electrons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f6bc25-8e3b-420a-8066-d95ee1088803/buluwojopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368fbeea-fb24-423a-86f0-4a98ccbadd80/42845833149.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_off00017796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17796 4800 bytes
SHA-256: fde3219e3f57cede7401be9b96493275ade5de9b5ef48b1fdc74ce4220754037
font_01_sfnt_off00018804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18804 14280 bytes
SHA-256: b3c524c7c596fb605c340b7846cc2c0ec7446d3999a65f7dfcb2803317a6ee62