Malicious PDF — malware analysis report

Static analysis result for SHA-256 86938268938435e6…

MALICIOUS

PDF

76.9 KB Created: 2021-04-02 06:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8a73819268598a502ef4551bd3cbf763 SHA-1: be076935642158c3444b980e0d7f426e2ce6de50 SHA-256: 86938268938435e6943debdb2e387f9f0eaa23e3fc021bd7a690d70add4573c3
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://xajibur.ru/award?keyword=west+pulmonary+pathophysiology+pdf+download PDF link annotation
    • http://vipadobotisituz.mygamesonline.org/48015779211.pdfIn PDF document text
    • http://airned.ru/should_we_pray_to_diegoeqz3w.pdfIn PDF document text
    • http://paksorond.xyz/45425750169plt30.pdfIn PDF document text
    • http://airet.space/fijevezebiqzy9f.pdfIn PDF document text
    • http://cupe1.ru/fronius_ig_plus_a_10.0-1_unizw8hx.pdfIn PDF document text
    • http://optalpha.com/bissell_pet_pro_carpet_cleaner_how_to_usezojht.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/25485140566kzxc0.pdfIn PDF document text
    • https://xevowuzari.weebly.com/uploads/1/3/1/4/131437308/valiponuxabolelora.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/7398820.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/2488529.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/b72cb582-2d49-4afe-badd-9cbbdb4bd049/the_husbands_secret_book_ending.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_d52d2643cef24f878b1691665a67e6e6.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_3f75fbe458164c5580f52b7d699929c8.pdf?index=trueIn PDF document text
    • http://wodowepakimeko.onlinewebshop.net/safenorugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c226d6bd-d2cc-4858-aa72-bcb8e9f87e99/48157834661.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_d3dc8a0a27724b56b9a20b7e0c36931f.pdf?index=trueIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_8d6fed4627504b61aa93252acc081b57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa4ecd3-8ba4-4cd0-8ff5-89482258fa30/64657769730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/190f4d06-1eb3-4706-ad98-5da7d87c8f2b/how_to_prepare_for_qa_director_interview.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_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 5664 bytes
SHA-256: e41a2a213824d0483a78c1c700cf502430c2d328cdb19fb16c5b566a935c4fd9
font_01_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 11040 bytes
SHA-256: 5a1fa7cdec77258dc39fbbff5f4e37a735719d0b3b7eb6f6643ce2f84e62d336

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