Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea53645a05fefae1…

MALICIOUS

PDF

74.1 KB Created: 2021-02-18 10:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 20ab1abd5de3dec70fa064fad1c57e0a SHA-1: cd9de0c0e8319f35f803bac78472dbf2dbd89ce2 SHA-256: ea53645a05fefae1d22eaebaee9b56a021ab2865b3f14a203a0435b15f80cff4
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. One prominent URL, 'https://maypoin.ru/strik?utm_term=how+to+test+sense+of+smell+at+home', suggests a lure to a potentially malicious site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm hosted on disposable domains, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=how+to+test+sense+of+smell+at+home PDF link annotation
    • http://fb-pageunderreview.com/17299371784ax18a.pdfIn PDF document text
    • http://pelistens.xyz/67261404237yy75q.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/acls_manual_online_free.pdfIn PDF document text
    • http://sfr-webmail.com/luravebokopin0gsk4.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/tasumalarigi.pdfIn PDF document text
    • https://mokovudome.weebly.com/uploads/1/3/4/5/134598928/8007cf81a068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duposul.epizy.com/spider_man_game_for_pc_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/xugemapefisitop.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/baby_doll_dp_images.pdfIn PDF document text
    • http://vakisetituli.rf.gd/fryern_junior_school_ofsted_report.pdfIn PDF document text
    • http://waverotefiwob.epizy.com/arya_2_film_song_video.pdfIn PDF document text
    • http://sabuxixu.epizy.com/lejuw.pdfIn PDF document text
    • http://jogisav.epizy.com/hipaa_violation_reporting_timeline.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/caller_tune_app_airtel.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_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 4964 bytes
SHA-256: 8340326bf4a8a375f51be8adcb77e52a64cfef21b43e70766e4de9757a2c949b
font_01_sfnt_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 10152 bytes
SHA-256: 86db0e3658dca49d1950a2723330481498bc73b671ab89f358cd9b30bc7423e2

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