Malicious PDF — malware analysis report

Static analysis result for SHA-256 154e8f7a6db442d8…

MALICIOUS

PDF

73.2 KB Created: 2021-02-28 08:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c52eff01e78705f8f4fad433a6bfadaf SHA-1: d112095a1c4e36486ee2a4567822fde51e825dbd SHA-256: 154e8f7a6db442d8091540cfbe5cc87585eaeddb160d0db733f6da0ef77583c3
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the ML classifier and ClamAV detection confirm malicious intent. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=how+do+you+make+an+appointment+at+the+dmv PDF link annotation
    • https://cdn.sqhk.co/dolitife/jphhJlm/smart_applock_app_android.pdfIn PDF document text
    • http://figebofisekozoj.22web.org/eyelash_extensions_certification.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/the_kissing_booth_road_trip_book_ending.pdfIn PDF document text
    • http://idealicaitaly.site/icsee_for_pc_windowszxu0l.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/hfghLlS/american_off_road_extreme_races.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/pairing_mini_jambox_with_iphone.pdfIn PDF document text
    • http://tavafotuzefox.sportsontheweb.net/19842447582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_602e98349c22f.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/WQZpjLT/card_collection_appraisal.pdfIn PDF document text
    • http://kuxasubofutako.iblogger.org/parse_error_fix_using_apk_editor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/disefagobutoki.pdfIn PDF document text
    • http://nodubibinidam.epizy.com/angry_birds_friends_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/nccn_guidelines_gastric_cancer_2019.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_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 5172 bytes
SHA-256: fa79c7dd0b604af52a0df3c4c421427f2f4beb8e1f479037ce1c3cf35367b3ef
font_01_sfnt_off0000f3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 10544 bytes
SHA-256: 7796ba480401fe14617ff7fecf08d388356997dcf8f85be28e9a5c6cd9546689

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