Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb289cc227f38e3…

MALICIOUS

PDF

76.7 KB Created: 2021-03-23 19:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 79e4e271cfa1332542a7b64b714d8102 SHA-1: 27d953834fc509162a823a5f33f0f3d860ce02af SHA-256: 2bb289cc227f38e32987bdc21eda287861c5d39a68c715cd6de0923196d32efe
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'school days game for android' and 'wkhtmltopdf', indicating a potential lure to a fake game or software download page.

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://vilenefex.ru/123?utm_term=school+days+game++for+android PDF link annotation
    • http://gogemupiru.22web.org/apple_ipad_user_guide_ios_12.pdfIn PDF document text
    • http://bogplaktnc.fun/87870097752u7iws.pdfIn PDF document text
    • http://esportzmlevent.com/bhojpuri_hit_song_mr_jattk4svt.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/xumebeg.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/9746f5b.pdfIn PDF document text
    • https://dufurewamefo.weebly.com/uploads/1/3/4/5/134595550/rutoponorufifoturegu.pdfIn PDF document text
    • http://asta-stroy.ru/allen_bradley_powerflex_inverter_manualgbfva.pdfIn PDF document text
    • http://agent-ritual495.online/491327243250kbfb.pdfIn PDF document text
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/tigerurarij.pdfIn PDF document text
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/leguto_solederora_lafigutojadason_rudowogerato.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/pipaneku/centrex_3000_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/80847206680.pdfIn PDF document text
    • http://fotopokidag.epizy.com/bevanesokuxa.pdfIn PDF document text
    • http://vaxaguv.rf.gd/is_it_legal_to_play_online_poker_in_new_york.pdfIn PDF document text
    • http://fepujevuzal.rf.gd/look_back_in_anger_act_2_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/59163318173.pdfIn PDF document text
    • http://puzegekizizovin.epizy.com/punjabi_chutkule.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/happy_birthday_cake_image_name.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/40698354419.pdfIn PDF document text
    • http://zixupav.rf.gd/33654774927.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_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 5640 bytes
SHA-256: a705f91fe39a7f6e636a9a1ae4a5cc4505400db30f78fdf036e775ec35fe8a5b
font_01_sfnt_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 10532 bytes
SHA-256: efd570a7e8bea493ab0877e069a10b55265e3e167ed4eb1b5f28c525c6c11460

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