Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae43556edae8d77…

MALICIOUS

PDF

91.7 KB Created: 2021-05-18 20:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b7e36de7e84623fde3e634f4872c168b SHA-1: d915ba8393cc50077f6d1eadae5143854debfe80 SHA-256: eae43556edae8d776dab8719a3ddbbb72609fe7b0aaa70192f800eb8c37104bc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('botokaw.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=sukumar+roy+abol+tabol+pdf+free+download PDF link annotation
    • http://watulexop.iblogger.org/business_analyst_resume_filetype.pdfIn PDF document text
    • http://badodamibevije.iblogger.org/principles_of_design_emphasis_photography.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380076/normal_5fe4b39b1149c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413467/normal_6060bc8eed934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5fdf71d1e4ef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_600ed64db6774.pdfIn PDF document text
    • https://kofepuxola.weebly.com/uploads/1/3/4/7/134718869/zozasamonixisawa.pdfIn PDF document text
    • https://nevofegef.weebly.com/uploads/1/3/4/8/134851200/1247751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_5fda56d2a700a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_603deeed22e2e.pdfIn PDF document text
    • http://dalutufajako.22web.org/hep_c_treatment_guidelines_aasld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_602cf3eda6186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_605d8e04163e6.pdfIn PDF document text
    • https://zidivopopa.weebly.com/uploads/1/3/4/3/134373798/ketuletanered.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gateme/wokipamuruxivotemebewolo.pdfIn PDF document text
    • http://kuwemujureza.epizy.com/anti_theft_system_for_cars.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/10_difference_between_trade_commerce_and_industry.pdfIn PDF document text
    • http://lajawul.epizy.com/22482993091.pdfIn PDF document text
    • http://jebufatibakuv.epizy.com/77286783145.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/wesexota.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/why_is_my_kenmore_elite_refrigerator_humming.pdfIn PDF document text
    • http://kitalanexu.epizy.com/gedobedik.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/preschool_counting_worksheets_1-_20.pdfIn PDF document text
    • http://vowaderisosalel.epizy.com/10_zip_rar_archiver_windows_10.pdfIn PDF document text
    • http://bupokapif.rf.gd/hidden_pictures_printable.pdfIn PDF document text
    • http://xesovukefezusag.rf.gd/71330982346.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn 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_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 5508 bytes
SHA-256: 89e0f14db2e057b759e0986444b766f4503c5ad2c47b93984a69b6268106e8b4
font_01_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 10656 bytes
SHA-256: cb12ebf4e70e86a1d0c3d4b616c487c5063d43c9c937b3ba319c1b06e8b024f8
font_02_sfnt_off000123a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 10984 bytes
SHA-256: ebec29db561d9257e97c1f0ec59dff2e80a272151311a845f155f6d4c6d6081c
font_03_sfnt_off0001498b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498B 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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