Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea78872cf62827ef…

MALICIOUS

PDF

77.7 KB Created: 2021-02-24 20:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 47bf5c4e026baca064dd387415222839 SHA-1: 245f3d1cb208e5c8bc4e24d31d79ddc949f50be7 SHA-256: ea78872cf62827ef6b3d342b3b57b6fa94849f3308ddfae3a3c8b898edfd5966
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs points towards an attempt to download further payloads or redirect to phishing sites. No scripts were extracted, but the overall structure and URL distribution are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://bologen.ru/strik?utm_term=berkeley+online+data+science+program PDF link annotation
    • http://basiditdcf.space/awadhesh_premi_gana_video_songd03pg.pdfIn PDF document text
    • http://libralab.digital/xowebejofakawifugisotaj8w48.pdfIn PDF document text
    • http://redtea.space/dragalia_lost_summon_simulatorg8ky8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499651/normal_602d9c652d575.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/dewalt_miter_saw_stand_heavy_duty_with_miter_saw_mounting_bracketshv5m8.pdfIn PDF document text
    • http://mozafebafurekuk.iblogger.org/isotope_notation_with_charge_worksheet.pdfIn PDF document text
    • http://wivejudotimog.22web.org/chiari_malformation_symptoms_treatment.pdfIn PDF document text
    • https://latapelubatute.weebly.com/uploads/1/3/5/9/135960370/koxezumaririki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_602fc4f23d2ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372354/normal_5ff64a25bf1e4.pdfIn PDF document text
    • http://meetchat.space/hazard_identification_and_risk_assessment_template_xlsgtipr.pdfIn PDF document text
    • http://wowitaly.space/baby_boss_movie_in_dual_audio2okpv.pdfIn PDF document text
    • http://trastqort.online/biology_corner_answers_key_epitheliais4fa.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
    • http://kuparego.rf.gd/tigid.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/android_phone_tracker_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/tour_guide_karimunjawa.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/book_reader_app.pdfIn PDF document text
    • http://zoxipugezamubuf.rf.gd/how_to_replace_lid_lock_on_kenmore_washer.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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 5396 bytes
SHA-256: 888587d701bf07b2fd084cc19ac983b2920a02f743f233233b907e3f98af379a
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 10728 bytes
SHA-256: 177da9711fbe7932f1a15d69ae08002f436145b7adf917040e7f453afd250655
font_02_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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