Malicious PDF — malware analysis report

Static analysis result for SHA-256 73738957a4d8d3e9…

MALICIOUS

PDF

78.7 KB Created: 2021-05-16 04:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 981da26e246ac1ab28c3e0491f905e72 SHA-1: d2a3b7a4ec499a1c0b4c23e269beb703781b921a SHA-256: 73738957a4d8d3e96bb300020e679df1cbf982370fd4ca789e2285f3da7778e0
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, with several pointing to known malicious redirectors and disposable hosting services. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=simple+present+tense+exercises+perfect+english+grammar In PDF document text
    • http://fitnesspack.net/29998228097finqf.pdfIn PDF document text
    • https://jokasagumejede.weebly.com/uploads/1/3/1/0/131070006/e17883a9ec.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/hiaghag/zombies_vs_diy_store.pdfIn PDF document text
    • https://cdn.sqhk.co/wobagibu/gQThe7G/4187740898.pdfIn PDF document text
    • http://kfcrabota.ru/reformed_presbyterian_church_near_menzdti.pdfIn PDF document text
    • https://piwupibuzidiki.weebly.com/uploads/1/3/0/7/130739867/01b20593.pdfIn PDF document text
    • http://it50discount.pro/17625344077j1chb.pdfIn PDF document text
    • https://fanamiwa.weebly.com/uploads/1/3/4/0/134013174/68e7cc792665.pdfIn PDF document text
    • https://cdn.sqhk.co/kolazapikib/aifjjtx/bepodoril.pdfIn PDF document text
    • https://gejabadofezeda.weebly.com/uploads/1/3/2/6/132681436/421fbd6.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/wolewadomosem.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/eieigQB/giant_food_stores_open_on_christmas.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/jhigghd/oceanhorn_2_apk_obb_download_android.pdfIn PDF document text
    • https://dudixojazimonam.weebly.com/uploads/1/3/4/6/134638097/5661461.pdfIn PDF document text
    • https://bokoxopeke.weebly.com/uploads/1/3/4/2/134266118/b897b0c179.pdfIn PDF document text
    • http://best-store.club/adjectives_of_character_worksheetf889e.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/3b1ca22a-e800-407c-ba24-e72299c01921/free_online_sql_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9405a0fb-b339-40bf-b321-02583501842f/shadowrun_hong_kong_gobbet_lessons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f668d92-f130-40ef-b0e6-2fd6267c4877/48703251908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda14e38-bfe4-458a-bbdd-0bda59fd1257/rojagidejidawosananiwat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b38486-d1da-400d-88b1-20744c8a3e99/the_alienist_book_ending_spoiler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4fcbbb-3df8-41b6-ba06-ccf41eb19d35/how_to_use_grater_attachment_on_cuisinart_food_processor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4f1736-cdcd-4ed2-9fa3-2537f758d36a/posupower.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_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 5600 bytes
SHA-256: fd650b2ad31fc5ccf58bb793a6d7a52e70ed833f8c8e14fe64f2c78676f02551
font_01_sfnt_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 11184 bytes
SHA-256: 4af69c04a5e0615c2ad8f4806ea86deba410f7334f820dfef34439f74b0dfd20

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