Malicious PDF — malware analysis report

Static analysis result for SHA-256 012555ca5b47234d…

MALICIOUS

PDF

72.1 KB Created: 2020-12-16 07:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4ba7a4039ab7e63aaf2926863e9d5fbe SHA-1: cc575b5fbf114656d840f972c4626b5fa57bf0b7 SHA-256: 012555ca5b47234de7ef253198062ebda00e1d5f0ef2b1e003b4990ce4242d49
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spamming operation. The embedded URL and the document body, though heavily obfuscated, point towards a lure related to academic reports. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan.

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://trafffi.ru/wb?keyword=recrystallization%20of%20benzoic%20acid%20lab%20report%20conclusion PDF link annotation
    • https://fimegelepa.weebly.com/uploads/1/3/3/9/133999933/wuvetitasuzek.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/zetubakuz/kbb_used_cars_pricing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dfe72f7-7a6b-4490-99d1-634b1efc5dc5/raperutajob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04310dc-9484-4492-ab33-922d3d332d7c/hyannis_transportation_station.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56ccf9955c744b559bc7a/t/5fc863b2dcb5b260797a954a/1606968245738/homeschool_programs_in_va.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ee6f21-ee86-4744-a1fa-b69e0700801b/72591374007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41839ff9-374a-46b5-b99d-bee991ce1d9f/bunuzunubedekuzobigepur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15cf688-25ee-4e66-944e-9c5e42cd603d/jirililafaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd67a56e-c5ef-45ac-9057-d81acd2c0d7f/37289748409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765952c9-7e66-4650-b1ac-8cd64a258c13/vusexedaluxofoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3a0a16-7a70-48d7-ad02-862df58f90bd/how_to_mute_discord_channel_for_everyone.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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 5448 bytes
SHA-256: 0a262638ed5f123e6256afedc9aaba6e403ee6db26b0d87fe3d9b25d591e7ebc
font_01_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 11232 bytes
SHA-256: 31bedb6af39c42d4adeb63e87cc272bff379bebf8a8b2e28430d53b521074c4c

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