Malicious PDF — malware analysis report

Static analysis result for SHA-256 19622315105cfe29…

MALICIOUS

PDF

162.4 KB Created: 2021-03-09 09:27:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b3cb3000fc764e4e9f37901924a26951 SHA-1: 7bc56c455c21e4d3e6615d7a20e92e3c7eb42c82 SHA-256: 19622315105cfe29cab288bb05a700bb460ca368b6c6cb6ac39b66e2b6ab2c99
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one pointing to 'jumiwimov.ru', suggesting it's used to redirect users to potentially harmful content. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://jumiwimov.ru/award?keyword=biodegradation+of+lignin+pdf PDF link annotation
    • http://artrosil.xyz/excel_formulas_if_then_sum2ptw1.pdfIn PDF document text
    • https://cdn.sqhk.co/mesafovojifo/vriajjE/damovotafubikorebuk.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/gjgghgV/sharkbite_codes_2020.pdfIn PDF document text
    • http://instapriz.website/amazing_spider_man_comiclaf60.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/how_to_use_sanwa_analog_multimeter60yv8.pdfIn PDF document text
    • https://cdn.sqhk.co/razilipot/imGsgjQ/national_geographic_telescope_app.pdfIn PDF document text
    • http://creditreportus.info/neet_biology_syllabus_2018rlr5c.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/higYDig/pugete.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/521851354g3i7z.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/cqgfxRV/63117318702.pdfIn PDF document text
    • http://car-test.pro/vodajuginuxarolibuxudja4bz.pdfIn PDF document text
    • https://lebugaboforov.weebly.com/uploads/1/3/5/9/135976333/be1a86626.pdfIn PDF document text
    • https://divojalu.weebly.com/uploads/1/3/4/6/134664609/wafebebagowotaf-wixipezo.pdfIn PDF document text
    • https://xuzitimezavut.weebly.com/uploads/1/3/1/8/131856372/5eebd5cbc5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_8a94448183854e12aac029b8d6b7880f.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_737e205b7c104aebbbe6f97fd672e02b.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_6adad3e856e94044898863e3947abdcc.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_8d05ef554f6f4037aba6b173b417fe90.pdf?index=trueIn PDF document text
    • http://tuvuwase.rf.gd/45207406822.pdfIn PDF document text
    • http://sozazavore.rf.gd/gmat_unofficial_score_report_sample.pdfIn PDF document text
    • http://xelidamos.epizy.com/remington_beard_trimmer_guide.pdfIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_8ead73e0e8484c5abf063fdbc45f9ee4.pdf?index=trueIn PDF document text
    • http://mafakizukizunof.epizy.com/guidelines_for_management_of_cushing_s_syndrome.pdfIn PDF document text
    • http://xajokaxakubif.rf.gd/town_building_games_mod_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000224e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224E7 5080 bytes
SHA-256: f85c70dc56b4a350a2354017ff747b3eca0bd99fba78bed83e4d4265be55a381
font_01_sfnt_off00023647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23647 15364 bytes
SHA-256: 3da95bee7f7193e55d282077713fd2dc22c86a80f572637901270a99b0bc8107
font_02_sfnt_off000266a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x266A2 16148 bytes
SHA-256: 49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648