Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aadf74d1471790b…

MALICIOUS

PDF

72.3 KB Created: 2021-01-06 20:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 81e52a05fbd8a9395dff07f1dbc605be SHA-1: df125c53ffdc24d443d338f8760bd68541699138 SHA-256: 2aadf74d1471790b2706c3ea91f6c9de07b0f413f6a1c41f7c5e16d1a55cd130
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffset.ru/123?utm_term=midterm+study+guide+physical+science PDF link annotation
    • https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/2965324.pdfIn PDF document text
    • https://cdn.sqhk.co/gurudulep/3yOhcAB/mega_ramp_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/JJbOmhf/mojubatip.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/foburadip.pdfIn PDF document text
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/lobopisim-sowolugu-nuvavasowisok-rufejot.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/d68787bfea.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/vedom_rijuxav_wopenesagik.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/98ed30fb-dfce-4bf2-89fd-0f68adf7ce92/understanding_bioinformatics_zvelebil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973de555-b98a-4f06-9d13-4afaa2ba20fb/31668972941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba85514b-1bdf-4fe1-8364-1300783b2dce/meeting_the_universe_halfway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d4afc3-8c66-4255-8eef-2b84f397c7d3/kid_cudi_the_rage_free_mp3_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/aberdeen_performing_arts_discount_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca3374a-a4b1-4a48-aab3-8a2883fadba1/47990465737.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/68806290608.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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 5592 bytes
SHA-256: fd737c35e591c8bbed7fd762bfefbe722cdeafed6ae6283ca923e557de79af05
font_01_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 10672 bytes
SHA-256: 62b55859d547f471f2e81b66514889636abf4eaf3a87d0713e5c196c0b6bf06e

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