Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19c4ce18bcdcf2d…

MALICIOUS

PDF

76.2 KB Created: 2021-03-28 06:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b701159aed595a87992dd5a7ed69d2ba SHA-1: 8582d249b42b98e42d82eb201bfb41b0f56e8bbd SHA-256: b19c4ce18bcdcf2dd287971a6d12b96451ede21b81bf935e0badb2454034f9ce
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 0.9989

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://zajinet.ru/123?utm_term=aashiqui+1990+3gp+full+movie PDF link annotation
    • https://cdn.sqhk.co/ranotigu/8hbmRvF/vomorazub.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/fjbWdhh/regulowikedazox.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/fgeihhd/7078448783.pdfIn PDF document text
    • http://klokisik.space/77289191306a6ojx.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/83374150468.pdfIn PDF document text
    • http://bisewilorilamej.sportsontheweb.net/the_telekinesis_training_method.pdfIn PDF document text
    • http://tegubija.mypressonline.com/wodowasu.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/p8icKx9/my_location_to_city_island.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/jjRjjJh/retro_racer_electric_bike.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/mepofazobi/ztGwicg/sipeb.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedifi/FjbGxjc/30487314595.pdfIn PDF document text
    • http://sentytld.online/balupu_telugu_ringtonesh1tmn.pdfIn PDF document text
    • http://fsfsfd.xyz/mudilejutorutedenivary51a.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/4405263337.pdfIn PDF document text
    • http://zathkatow.xyz/what_is_strain_in_echocardiography2quic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_74b6a255d8d4408a80850a4e78952006.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f590aa6-d76e-49eb-96d0-d2971853b401/learn_english_grammar_in_marathi_language.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/22153990732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad629d1-1af1-48d7-9c91-92994f567b66/how_to_clean_kohler_jet_tub.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_e078b71a846c475a9df6df29931e71c8.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_b8eca6087f8d440b8e3b8964feea62a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f5d467f-f15d-488e-80ce-5ffdcf7c2cdd/30254955175.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_7e20fd6e8911490691d4482cb5abfd1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec307ff-94e8-480b-9937-995b60ab21f1/fifty_shades_darker_soundtrack_download_mp3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 5604 bytes
SHA-256: 6ebe8d19b2a38b4bb1e694dcb4744a14d05c27c593859d244d80f4ba8b3b9d7f
font_01_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 10084 bytes
SHA-256: a5ffba1c763ca4b1345aaab90536abf83e3eb01f2b3ca13163651c8761196ad5
font_02_sfnt_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361