Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49aac1a01e9ae0a…

MALICIOUS

PDF

76.8 KB Created: 2021-04-04 00:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 46d526518822876e0ace8166f7d81a20 SHA-1: 677cc273ea83e05417c83f043dec6f34b2edcaac SHA-256: c49aac1a01e9ae0accbbf025ed2559842283d901a08a424ea668a2ec6d668641
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to educational opportunities, likely to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=aircraft+maintenance+engineer+ame+colleges+in+india PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459624/normal_6057ca1cbf010.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417141/normal_6000b664c78ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_6068e432cc929.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458125/normal_6003afc313201.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://turojupa.epizy.com/1205039128.pdfIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_7a4a31f331184a2089a1709c3041c45e.pdf?index=trueIn PDF document text
    • http://xupasafagimi.rf.gd/formoterol_fumarate_budesonide_inhaler.pdfIn PDF document text
    • http://degepedafapuf.epizy.com/xubuzinewi.pdfIn PDF document text
    • http://zuzipidagazetu.rf.gd/convertir_archivo_a_word_gratis_en_espaol.pdfIn PDF document text
    • http://fakozavovenabe.rf.gd/mariage_d_amour_easy_piano_sheet.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_ac70a56a80dc4f7e8a5d72f51ddbd6fa.pdf?index=trueIn PDF document text
    • http://bukepajusoka.rf.gd/film_review_examples_for_isc_students.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/sikigadedikeboka.pdfIn PDF document text
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_3440f1359e574f16a8d6ed6ed75af16b.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_f89622c8059740cfbe45a4f9600fdee7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/compare_and_contrast_romeo_and_juliet_play_and_movie.pdfIn PDF document text
    • http://futotaze.epizy.com/movumumimepofiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/72608870785.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/craftsman_5.5_hp_24_front_tine_tiller_manual.pdfIn PDF document text
    • http://betiravel.epizy.com/99191936013.pdfIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_b3bea0eb75c24a7d9f9c631617e06259.pdf?index=trueIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_98c56ead37b84db8b7572d0b6e74eaaf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patilawasu/boomerang_video_songs_free.pdfIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_126716cf3ea847c0b642150aef3ad4c6.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 5328 bytes
SHA-256: 873e6a32a2c385056c71f92bfc1d8a79802368e4edac801bd8cbe34af777b5a3
font_01_sfnt_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 11200 bytes
SHA-256: e4b579208abd125db71ec005c66f2ffda633a1d1a030cf232406009a4bcf859d