Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c9280701d9819b…

MALICIOUS

PDF

86.5 KB Created: 2021-03-19 03:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c19e2b44ee3ae1845081ad751d855898 SHA-1: 5d2925225b2fe176c5ede57b61380d727814d027 SHA-256: a8c9280701d9819b053ee14a4ce14e06c26276bda1b482a9fb412f23fee46d75
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards an attempt to redirect users to potentially malicious or unwanted content, masquerading as educational material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 5

  • 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://lozipotod.ru/award?keyword=class+11+maths+probability+notes+pdf PDF link annotation
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/6106815.pdfIn PDF document text
    • https://cdn.sqhk.co/fidinananale/Ehajdid/48679145368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367960/normal_6004730835b53.pdfIn PDF document text
    • https://cdn.sqhk.co/vuluzazogur/ep4hgh7/ear_infection_dog_cost_uk.pdfIn PDF document text
    • https://mitabepomumo.weebly.com/uploads/1/3/1/8/131872015/kigugumuwerosi.pdfIn PDF document text
    • https://mopuvavipobum.weebly.com/uploads/1/3/1/0/131070525/kowoduvisi.pdfIn PDF document text
    • http://fuxejezosajusop.22web.org/cambridge_english_proficiency_masterclass.pdfIn PDF document text
    • https://cdn.sqhk.co/jexozumumanu/o5wYNFS/formalist_analysis_of_the_necklace.pdfIn PDF document text
    • http://xeresorejal.iblogger.org/dish_network_bill_pay_login.pdfIn PDF document text
    • https://voxomusixexuso.weebly.com/uploads/1/3/4/8/134851372/93d8a3e15c7.pdfIn PDF document text
    • https://cdn.sqhk.co/wirumedaba/gyGhjZz/davadip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5ffa259ce8240.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/UgjUjeU/free_bike_stunt_motorcycle_race_games_2020_apk.pdfIn PDF document text
    • https://fatomomome.weebly.com/uploads/1/3/1/6/131606630/8169441.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_e4e20cf0d00844d88664b29f3cd388ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03e53fa-5929-4dba-a776-5453c4481ba5/28569772394.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_dfd2d076d8bb494692a6ab92c4987c9c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2d98a4-a8ba-4adc-bfc4-a37cb36964ff/6892789126.pdfIn PDF document text
    • http://zilazop.rf.gd/xifeka.pdfIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_c03348ed62ae4c6eb2a10345ef12c5c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d3147e-772e-4f4b-9341-b3e641728b8f/how_often_should_a_ford_fiesta_be_serviced.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_ddafb4de4eac47409c64fe2bd8c9e2e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96801ea-011a-4a59-9af0-1841a8b39e2b/gout_cookbook.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_6fbf6cbc879d45ef87a4c98c8a62cfdd.pdf?index=trueIn PDF document text
    • http://dozewejesan.epizy.com/52293387482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14206bf9-70f1-4597-bd42-03be9932fcda/15263592662.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 5388 bytes
SHA-256: de74583a009dcc0738b4a7e1426df2462ab3fe4c18a1be195f17644f5c1d3e6b
font_01_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 11508 bytes
SHA-256: f916ce7275cb2099f581ceb738c12034fb46a55200eddb125d839e5777ea4bd3
font_02_sfnt_off000127e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E8 16308 bytes
SHA-256: 750dc000697a0d333d631ab817bd4486d3a963fbd96a314da11b2d872bcf82de
font_03_sfnt_off00013dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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