Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c8d37fad3c665c…

MALICIOUS

PDF

76.9 KB Created: 2021-04-13 15:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dff74076a1adbdc9238a8d0407602e58 SHA-1: 2396838324160f307a2f54789f4b3529bfbad5eb SHA-256: f6c8d37fad3c665cdadbb29b487e257aa89643e5a586e6d317f9066d88cd6e5e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and ML classifiers, indicating a phishing or trojan payload. It contains a large number of external links, with one prominent link pointing to 'jumiwimov.ru', suggesting a phishing or malicious redirection attempt. The PDF structure itself is also suspicious, with duplicate object definitions, and the authoring application 'wkhtmltopdf' is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=click+clack+moo+cows+that+type+theme
    • http://dudipoviju.22web.org/gawibulijorovubanopib.pdf
    • https://cdn.sqhk.co/zojixemem/hjfhhjf/norewubogoxumibib.pdf
    • https://cdn.sqhk.co/xolofiwano/ifM7EZq/fusafawi.pdf
    • https://cdn.sqhk.co/naxiwakiwuv/DtjieEe/34606014051.pdf
    • https://cdn.sqhk.co/todiwapubu/geihkhe/clash_of_clans_bot_apk_2017.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xedewofuretujo/polycarbonate_sheet_glazing_bars.pdf
    • https://s3.amazonaws.com/ninasivol/survival_skills_primitive_location.pdf
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_99fda5e0afed4ddb9459e156083fe41a.pdf?index=true
    • https://s3.amazonaws.com/regovadeje/air_force_leave_carry_over_form.pdf
    • https://s3.amazonaws.com/dudigonifu/new_c_diff_guidelines_2018.pdf
    • https://s3.amazonaws.com/sorogamat/pomapafuturimuwaso.pdf
    • https://s3.amazonaws.com/fatikonavori/96236746792.pdf
    • https://s3.amazonaws.com/murudute/silibeboboto.pdf
    • https://s3.amazonaws.com/fuvidokibet/xibolusujeluzegubi.pdf
    • https://s3.amazonaws.com/pujirageg/sakutulimezago.pdf
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_9acc996f65464a94bd3c71a41aa48eae.pdf?index=true
    • http://nofufofivazogi.epizy.com/bibliography_sample.pdf
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_fef526a0824044cd9044a11140ecf7ba.pdf?index=true
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_83acc36acada4786b4877853979848fc.pdf?index=true
    • https://s3.amazonaws.com/banula/colonialism_and_the_city_class_8_worksheet.pdf
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_fcd91bdfb88a40fb80f9522df854aae1.pdf?index=true
    • https://s3.amazonaws.com/dugibabafod/masopivizawofinamibiz.pdf
    • https://s3.amazonaws.com/jikopot/12717602831.pdf
    • http://vawibafutij.rf.gd/3189124338.pdf
    • https://s3.amazonaws.com/zoluwivebiro/brand_equity_research.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7f.bin
4b47302c91740e390825f9904b13d86569ffcae65f534fe9ae9f4a3e0198e57f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 5240 bytes
font_01_sfnt_off00010149.bin
9689e65cd00242357bdb91e1c85996a6f66aa7cf5433a594b726d7cd1c1169b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 10768 bytes

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