Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fec4e071ce2d6fc…

MALICIOUS

PDF

87.2 KB Created: 2021-03-15 13:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 209fefea48280acccb05330cac006171 SHA-1: 970d4315f8f9bef06235155c087907d2609b669e SHA-256: 6fec4e071ce2d6fcc5da25257a6f10a3cfa72673fc79a91f1f44005de8fc32cc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 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://druttle.ru/wix?keyword=texas+instruments+ba+ii+plus+manual+reset PDF link annotation
    • http://jadebey-x.com/semobesajuxojurilukerej1axb5.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/fK9hhhc/comic_book_animated_movies.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/xaxugabirevuzdd43p.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/hcMgdia/gidavedeterafa.pdfIn PDF document text
    • https://cdn.sqhk.co/nepasibuta/Vihvidm/lugef.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/jazudjb/vatekavugivepijuba.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/hjCMsif/basketball_shoes_black_friday_sale.pdfIn PDF document text
    • http://strahauto.website/fluval_306_canister_filter_mediaac1mv.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/piff6id/goal._com_arsenal_transfer.pdfIn PDF document text
    • https://cdn.sqhk.co/pikevasoze/YjiJibg/12233174996.pdfIn PDF document text
    • http://yewes.space/547843869417u7gu.pdfIn PDF document text
    • http://rastet-malysh.ru/65524547694lkwdj.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/dba9dbb5-14ce-4646-8da8-4ff4fcd59164/invisible_man_ellison_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d1fc80-b8f8-4eb9-b7f9-ef01f68ae9e0/how_to_determine_value_of_baby_grand_piano.pdfIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_92ff19a066fd4280a8d29ace0eea21f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d2125d4-2e88-45cd-8794-471842a5426d/how_to_use_word_fillable_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b23367-9595-4bd2-9777-fdbc737585f6/ps3_controller_battery_life_vs_ps4.pdfIn PDF document text
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_d22be8e1daaa45bc8049f97b2a216e6a.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_f5f769867d4d42c78af9fcd38c46f768.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 5124 bytes
SHA-256: e04391bfed1983b0208b9f849c9b6076cd73b7dcda2847adbd00561dfafb7ba3
font_01_sfnt_off00011c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0001252b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252B 12184 bytes
SHA-256: 38c51e2d011d1a3fbe67ca33553f71d383824fc03c2e6e11acf8da5ac5778a5f

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