Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f7690f00b4226a…

MALICIOUS

PDF

72.7 KB Created: 2021-02-22 15:55:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3e4b2dae2fcbaf8955b246ddcc46b989 SHA-1: b71d2b6cd886adcdcab0f1dc71e684a37168648e SHA-256: 90f7690f00b4226aa2f5372485cc49bc56da0e336f5a8dd2f35c6cdd769a0b89
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a "devotional guide", which is likely a lure to encourage users to click the embedded malicious link. The PDF also contains numerous links to various domains, some of which are hosted on disposable infrastructure, further indicating a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=the+blue+book+devotional+guide In PDF document text
    • https://cdn.sqhk.co/kewawukufiju/udCqibe/5150820598.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/les_miserables_25th_anniversary_ost_downloadr2vvd.pdfIn PDF document text
    • http://kuvuradivikosef.iblogger.org/sovekewufoz.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/YhcxKia/54384032606.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/9idjbaC/scoruri_ticket_to_ride.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/jcqsEie/monster_truck_racing_games_2_player.pdfIn PDF document text
    • http://igcopyrightforhelps.com/riwepunsoh4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujisovi.epizy.com/church_administration_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/bloatware_apps_android_xda.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/asphalt_xtreme_hack_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/alcatel_1x_manual_portugues.pdfIn PDF document text
    • http://xazabivi.epizy.com/51851598213.pdfIn PDF document text
    • http://bibarixe.epizy.com/koterivufufalifibofogaka.pdfIn PDF document text
    • http://jijilijovejoto.rf.gd/catholic_confirmation_test_questions_and_answers.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_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 5028 bytes
SHA-256: 7df48a785974a70fffb56712c633b1bea48a3f93d6435164f874e4d0b28e6af0
font_01_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 10424 bytes
SHA-256: 78b403c1802d7b49947282cd1d756df4b8b90801b31b5a9b0feb495afa81d24f

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