Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5011ca9ca65b52a…

MALICIOUS

PDF

80.7 KB Created: 2021-03-19 10:12:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3d36e64f3af1715302fcbd53d4bae319 SHA-1: 6d6a118052c66528b6318c125da84de11d1ef05d SHA-256: e5011ca9ca65b52a55e98e7a96243740318bb76b545ffa557734cef41b367e27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/123?utm_term=arbitrary+waveform+generator+using+labview PDF link annotation
    • http://bumawusuka.mypressonline.com/romeo_and_juliet_movie_online_free_1996.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/geqDLha/giwosaruxo.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/introduction_to_wavelet_transform.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/ifDeo7h/sudawitofu.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/gea09jh/kovimesevurefozepoba.pdfIn PDF document text
    • https://cdn.sqhk.co/jomawutid/bTWigih/tom_and_jerry_characters_dog.pdfIn PDF document text
    • https://cdn.sqhk.co/rizanatu/ajevuhh/sarubolenut.pdfIn PDF document text
    • http://tiwujatujoput.mygamesonline.org/cartographies_of_silence.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/garmin_gtn_650.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/acls_2020_espaol.pdfIn PDF document text
    • http://bifovasux.22web.org/accu-chek_aviva_plus_test_strips_ndc.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/5giacBt/real_car_parking_multiplayer_apkpure.pdfIn PDF document text
    • http://vefavirona.22web.org/cm_awas_yojana_mp_form.pdfIn PDF document text
    • http://jidudilubad.mygamesonline.org/42062979097.pdfIn PDF document text
    • http://kodepovorivapi.mygamesonline.org/hematologia_tipos_de_anemias.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/naxiwurikibuwepa.pdfIn PDF document text
    • https://cdn.sqhk.co/sexobivobufo/gcG6Fja/11st_6lb_into_lbs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zizolim.rf.gd/is_there_a_new_seal_team_episode_tonight.pdfIn PDF document text
    • http://kugibujupedo.rf.gd/bemarofebogifubonokeka.pdfIn PDF document text
    • http://sobikunukozi.rf.gd/past_perfect_continuous_tense_worksheets_with_answers.pdfIn PDF document text
    • http://xugeseza.epizy.com/99340090702.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/dish_network_channel_guide_local_channels.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 5468 bytes
SHA-256: dc68a32530b75a32279bbb4014ba50f82116b0382f0c08e9a7c68aae7c018d6f
font_01_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 10408 bytes
SHA-256: 0f72293fe8077840fc3f8dcf18511b4f45acd8c0584c8d834b71ea1be1005349

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