Malicious PDF — malware analysis report

Static analysis result for SHA-256 3794923f2c244cd0…

MALICIOUS

PDF

84.1 KB Created: 2021-05-15 00:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8471949fe42507a6b5fc1f34acc5fa48 SHA-1: 5f87c9143491cdebdeb63e69d8a519275295d140 SHA-256: 3794923f2c244cd0c080d42ee4b2818281fefce678d9ac67bcbe0c2673e7c7fe
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm on disposable hosting, likely to distribute malicious content or manipulate search engine results.

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://dugedepap.ru/strik?utm_term=james+rickards+currency+wars+summary PDF link annotation
    • https://cdn.sqhk.co/vopunokapire/EWPpgdf/gipaduxezevapazivogala.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/VFEDXTr/sling_tv_vs_youtube_tv_channel_lineup.pdfIn PDF document text
    • https://cdn.sqhk.co/kixalixu/ic0oy6E/retrograde_lyrics_meaning_james_blake.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/jahfHia/fastest_ball_in_cricket_ever_recorded.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewejav/17qLPRy/una_vida_saludable_frases.pdfIn PDF document text
    • http://covidcapsule.world/biologia_3_eso_santillana_solucionarioinks7.pdfIn PDF document text
    • http://prodson.fun/football_west_masters_20203d9re.pdfIn PDF document text
    • https://cdn.sqhk.co/xazewizol/uqhdu8r/69401073324.pdfIn PDF document text
    • http://rp-youtube.fun/473433012750mt60.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/4VbPfie/57657106031.pdfIn PDF document text
    • http://menesoger.iblogger.org/sedentarismo_segun_la_oms.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/bokofapig/36719434272.pdfIn PDF document text
    • http://tejogasev.rf.gd/vifalo.pdfIn PDF document text
    • http://nabapuxamiluj.epizy.com/spoken_english_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/constructions_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/extended_essay_guide_2018.pdfIn PDF document text
    • http://mipojumujudi.rf.gd/free_vpn_settings_for_android_mobile.pdfIn PDF document text
    • http://taxisariwoboduz.epizy.com/208560035.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/caida_libre_libro.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 6548 bytes
SHA-256: 96dd2fc0f29e4e72cc5c2e2558c4128b545e184584c6e82281828d37e57e44b6
font_01_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 5300 bytes
SHA-256: 3ec9111a066bcb06a25748f948bf5a2da1692f6e9c126bc3e2c38ec26fef89c6
font_02_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 11636 bytes
SHA-256: 31fb202881b5523b352d9d7615cc180efff7986e6723d6661113e3437a5c0ef3

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