Malicious PDF — malware analysis report

Static analysis result for SHA-256 d810943c94c1580b…

MALICIOUS

PDF

78.7 KB Created: 2021-03-19 17:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 08531d327cb9d65b26276b3ef0fa701b SHA-1: 5cff12f5928ea1ca11915e3f74d3f664933d85aa SHA-256: d810943c94c1580bb2d8bf8daf94bcac605077d425466cc122c104df22406dcc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=nordictrack+commercial+1750+incline+motor PDF link annotation
    • http://realwockyc.info/jvc_model_number_jlc37bc3002qtaom.pdfIn PDF document text
    • http://fito4ka.xyz/vokote495ep.pdfIn PDF document text
    • http://tuimag.ru/66394781861wq6lr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_5fe97043edbea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477863/normal_5ffcb26eadd98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459182/normal_5ffc588b088f3.pdfIn PDF document text
    • http://tcerkovniekupola.space/elementor_block_templates_free6yjza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388157/normal_5fcc454e9d70f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_60329266c35a3.pdfIn PDF document text
    • http://tinuliv.22web.org/acrobat_reader_for_windows_7_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzuxoluzetirig.rf.gd/how_computers_work_book_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/93772162961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff3758c-cc9d-45af-8d7e-643903924e0c/how_to_setup_vizio_soundbar_to_vizio_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/video_akb48_ponytail_to_shushu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e19d549-f71e-468b-9ab2-618c13b877fd/are_readers_digest_condensed_books_worth_anything.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/burger_master_game.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/dawajipipepobuvulip.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/43379431269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2fe021-6570-4fdc-88b4-4abfb7e32073/55069084663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d34f79-ad23-47cd-bef8-b140c477f1f7/89184101712.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_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 5336 bytes
SHA-256: 289ceecd8041ccd8986a7729910bccff985884efb1a12a008ca8c4330d86e1d7
font_01_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 10452 bytes
SHA-256: ba9d04c252024e4319ea77a7ca4e7e4e6f99fc39458ae435bfc8bee8bcaf552c

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