Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fdd8e34e8f8c28…

MALICIOUS

PDF

66.6 KB Created: 2020-12-23 20:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d9c16e4603c7a6fdd5eca4391f719683 SHA-1: 227d225abe1ce403f17f0c62be55646c61854161 SHA-256: d5fdd8e34e8f8c281a94a2ec3b27b1afbd638926a015f916808bc20aeb47875f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on services like Weebly and S3. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests an attempt to leverage external resources for malicious purposes, possibly through embedded JavaScript or other PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=etowah+county+courthouse+number PDF link annotation
    • https://piwoviwilo.weebly.com/uploads/1/3/4/3/134386066/xomowuramefafe.pdfIn PDF document text
    • https://kirugivedipabaw.weebly.com/uploads/1/3/4/4/134464293/xijijegurijobikibo.pdfIn PDF document text
    • https://bajusokizuz.weebly.com/uploads/1/3/4/4/134400974/gotavopozif.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/nevifemis-joladoz-gepubomoguwolad.pdfIn PDF document text
    • https://lezotaxodad.weebly.com/uploads/1/3/4/4/134432483/f4dd41e224fbe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5fb4f31cabcb8.pdfIn PDF document text
    • https://vozutububedem.weebly.com/uploads/1/3/4/3/134372478/50d8ba41f.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/ruvavabasipusak.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/vetamedisoz/14328145039.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/busavimakijelezono.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/75854620931.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/indian_flag_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f83bad1-49a2-4ac8-bf23-42d9dd048d3f/international_t444e_engine_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/zuribaxafevikeliwumanulid.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/pse_stinger_x_owners_manual.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_off0000c656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC656 5296 bytes
SHA-256: 012943605594c214be56ec54018a5d79665ff063b73d490d5b6738d2c6058b1d
font_01_sfnt_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 10912 bytes
SHA-256: 81c61355ab5e816ca59291f4ac40df00589142b59fdbce54d20dcb90b65182a4

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