Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea1b93d9bba19ac…

MALICIOUS

PDF

94.3 KB Created: 2021-02-18 23:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 86e99b4237761ff29a84a49592d25456 SHA-1: 8f0dda5661503d9c4000afce1a6700547c30961b SHA-256: dea1b93d9bba19aca93457c11f91e2ebb0e022e5f941df7580b56866282e9a7d
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a tactic to manipulate search engine results or distribute malicious content. The PDF's structure and embedded content indicate it's part of a larger campaign, likely initiated via spearphishing.

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://baarspo.ru/wix?keyword=source+misattribution+error PDF link annotation
    • https://cdn.sqhk.co/jirudumom/uhjgcid/miluvexelizesar.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/l0giIhi/awiting_pambata_tagalog_nursery_rhymes_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/ZwPrhf7/skyscraper_movie_score.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/haiejKS/water_slide_adventure_vr_360.pdfIn PDF document text
    • http://martans.space/claro_recargas_el_salvadors5wit.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/5AKgh73/vintage_tin_toy_race_car.pdfIn PDF document text
    • http://durukogemegaxib.22web.org/43167761506.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzojivemepe/uibUgh2/n._o._v._a._legacy_mod_apk_2020.pdfIn PDF document text
    • http://tovelksa.website/cyberpunk_2020_night_city_mapa3zk3.pdfIn PDF document text
    • http://ag-management.space/businoro7ekn.pdfIn PDF document text
    • https://cdn.sqhk.co/jenexovu/LOjjjhb/ates_ve_su_3_kitap_ozeti.pdfIn PDF document text
    • http://tunizunifegitof.66ghz.com/lipaxuzikadefusuzijesuw.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/Ciegejc/dragon_quest_11_switch_cheats.pdfIn PDF document text
    • http://azalea.store/wepesiluguts736.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/qgcoS22/pidavel.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/chahbhe/ice_cream_lyrics_raekwon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuneviwek.epizy.com/does_costco_sell_magic_bullet.pdfIn PDF document text
    • http://palowok.epizy.com/fitukokevanaribojo.pdfIn PDF document text
    • http://degefoxovovi.epizy.com/xudoworizowitibakeli.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_off00013648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13648 5156 bytes
SHA-256: a89e74f60618e527c166e0260e6545af3b1c8bcb206bb233b68169d7e7d2a1f0
font_01_sfnt_off000147b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B7 10668 bytes
SHA-256: 54f837163fabbdb89de5ba038ad1a4fb70201fa66012c8d58a2272058eec0349

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