Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8c2478874ad02a…

MALICIOUS

PDF

84.3 KB Created: 2021-03-25 00:38:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cfe2565a81f105f64d68300627e86bcd SHA-1: 502917d46f262e955f5b26ca6e4bb8c14db38ccd SHA-256: 9b8c2478874ad02abcc1d92a851f57a4c7f986f70f45f44bf35917c30c452df0
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of external URIs and the 'SE_LOLBIN_RUN_COMMAND' heuristic suggest the document is designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jacksth.ru/wix?keyword=persuasive+essay+template+5th+grade PDF link annotation
    • http://redawifaki.22web.org/pengertian_komunitas_dalam_biologi.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/7jcMDje/20943652964.pdfIn PDF document text
    • http://fivogudog.iblogger.org/ashrae_62._1_2013_espaol.pdfIn macro / runtime command snippet
    • http://rastet-malysh.ru/write_an_equation_in_slope_intercept_form_given_a_graphox9oq.pdfIn PDF document text
    • https://gakatonigi.weebly.com/uploads/1/3/2/6/132681340/4960537.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/zRjhjfO/marketplace_foods_minot_nd.pdfIn PDF document text
    • http://persequenteamsohbet.com/township_tale_mapc8owy.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/hjw1gid/zakotor.pdfIn PDF document text
    • https://cdn.sqhk.co/lasijutag/ifgjPCu/zoresiluvobolekigon.pdfIn PDF document text
    • http://rawenspant.online/532762313032qpt7.pdfIn PDF document text
    • https://fopalese.weebly.com/uploads/1/3/5/3/135349797/nomewogobup.pdfIn PDF document text
    • http://bottlechainworld.com/high_school_admission_essay_examples_about_yourselfc55tv.pdfIn PDF document text
    • https://cdn.sqhk.co/jidevumedure/ben8fia/woletasukikiji.pdfIn PDF document text
    • https://mexukisigugat.weebly.com/uploads/1/3/4/7/134702857/8116606.pdfIn PDF document text
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/siwopuxur_zokilemogaraju.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/livivuvuwugeb/85152079529.pdfIn PDF document text
    • http://vevofiwimim.epizy.com/the_expanse_season_5_release_date_uk.pdfIn macro / runtime command snippet
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_9f8b80732edf4e4ea7f8d5ac30f8a909.pdf?index=trueIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_62b6b5037fe344458084227ecb0aa043.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_7037ffae0dbb4574bd006ffb96e915cf.pdf?index=trueIn PDF document text
    • http://wedowif.rf.gd/bharaate_kannada_movie_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/mewokunelasinanogetas.pdfIn PDF document text
    • http://bimomog.rf.gd/11305123943.pdfIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_50b1d42ef3504f9fad3958335d2bc251.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_cfd4efc4e5064c31b14dbac58ac1e397.pdf?index=trueIn 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
    • https://s3.amazonaws.com/livivuvuwugebIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 5660 bytes
SHA-256: c88fcf36db21c8df85ed4e1ed98377e6dfa322ed29f9b867d616ea4b047221b6
font_01_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 10696 bytes
SHA-256: 8c23bce301e71f392a272cc8627777277e57d7861bd596d7d7c5d35b876da62e

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