Malicious PDF — malware analysis report

Static analysis result for SHA-256 a533a063d64ff356…

MALICIOUS

PDF

70.8 KB Created: 2020-11-09 18:42:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 53881629f7bee9d22ce21c12098ac03d SHA-1: d8e7840186a136eab0200ed72ddf15c2cb5b6e74 SHA-256: a533a063d64ff356ff45ef4c803d0d952d6466e461ae39884332bd1b1b2e3019
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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?keyword=impossible+quiz+answer+41 PDF link annotation
    • https://zilowefid.weebly.com/uploads/1/3/4/5/134510497/4466dc131db.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/lixavej_rivutavipulox_vunezikavad_lirumonoguwako.pdfIn PDF document text
    • https://mulovepo.weebly.com/uploads/1/3/4/6/134666579/d76a74efef1580e.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/8536171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5fa5f1084a10d.pdfIn PDF document text
    • https://sevivuninuk.weebly.com/uploads/1/3/4/4/134459749/5000008.pdfIn PDF document text
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/wusiliberuga.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/litunux/the_devil_in_the_white_city_epub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852cbc6f-6bb2-41d7-93a5-06ef564824b5/jexelafesevaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe2b1c0-3df7-4282-8e67-7f2f3083621a/27463433076.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/best_town_hall_9_base_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/completing_the_square_practice_problems_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38228410-4446-4952-b552-921a4af2f790/can_bearded_dragons_eat_watermelon_rind.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/momomujuwagonixuxijemotit.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/board_kings_cheats_march_2019_no_verification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72648a1b-2754-4a9a-bc23-cf5f35948f42/napub.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_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 5452 bytes
SHA-256: 78893ea8aad6d0704739d2a0c94e3e9e6ed9d7db77d897aab5a77363736bb668
font_01_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 10764 bytes
SHA-256: d2e342d225e7a5493975e65d5f4112f45ef65ffa9ef88062520dd5f7e07b0989