Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c5226c44d4672c…

MALICIOUS

PDF

73.9 KB Created: 2021-04-08 21:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ac5381ea476a28b4c0598d639664e494 SHA-1: 8238d729db350ccfa0597fe0849cc8264e36a3ee SHA-256: 23c5226c44d4672c78edad04b099fbacfa205c4f90b2118572d84c37342f9a14
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 0.9996

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://golowaki.ru/strik?utm_term=are+liftmaster+remotes+compatible+with+genie PDF link annotation
    • http://rezexepenoma.scienceontheweb.net/24453122946.pdfIn PDF document text
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/c8fc9.pdfIn PDF document text
    • http://sepibuzare.22web.org/12239542976.pdfIn PDF document text
    • http://kayikciakademi.com/relion_prime_error_code_e226y50y.pdfIn PDF document text
    • http://blognews.top/26449351688echuf.pdfIn PDF document text
    • http://tixshopclub.fun/30819294493kvdie.pdfIn PDF document text
    • http://kleomaften.online/minecraft_villager_profession_blocksobnxq.pdfIn PDF document text
    • https://dosogomufafana.weebly.com/uploads/1/3/2/6/132696174/pobajisinigezi-detuferejuxora-puxefotip.pdfIn PDF document text
    • http://pejelurim.getenjoyment.net/kumoketoxujewu.pdfIn PDF document text
    • http://good-production20.site/how_many_words_should_a_20_month_old_knowqu0yk.pdfIn PDF document text
    • https://rezivunafotete.weebly.com/uploads/1/3/4/3/134354631/31714b4.pdfIn PDF document text
    • http://startask.ru/magnetic_actuators_and_sensors_brauerr32bt.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/31102566355.pdfIn PDF document text
    • http://konsalting.info/tuesday_with_morrie_movie_trailer8j1ww.pdfIn PDF document text
    • http://vpntop.info/tubugf3559.pdfIn PDF document text
    • http://janexik.22web.org/sibum.pdfIn PDF document text
    • http://zoneeuro.pro/planeacin_estratgica_personal3gygf.pdfIn PDF document text
    • http://dududuw.mypressonline.com/simon_ielts_task_1.pdfIn PDF document text
    • http://uablog.website/dd_elemental_evil_players_companion_anyflipj51ma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tobikinos.onlinewebshop.net/9348728207.pdfIn PDF document text
    • http://jumuvurerurulap.rf.gd/wamajixokewemorivefamet.pdfIn PDF document text
    • http://nowonijefug.rf.gd/sanford_guide_for_antimicrobial_therapy.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE45 5652 bytes
SHA-256: 2d071f05c187a4a20dac8e5f8d3cb34948d0941f99b1b9fc9f53bf774825ea68
font_01_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 11756 bytes
SHA-256: 6b5c0cd833ebc7535c3f8d97013212cafb26375a8c3a68ebe42b6ce680c3f54f

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