Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b48c9168fc4fab…

MALICIOUS

PDF

71.0 KB Created: 2021-02-27 06:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0d7a3d62adde20fe0718ee6b57226e85 SHA-1: 13582faed68fd5d25418de8f6920de2cec229bf8 SHA-256: 48b48c9168fc4fabe9c57e64e302bba08b57f205021490a5f03f35bd84b080aa
166 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document's intent to trick users into believing they need a password for an archive, a common tactic to bypass gateway scanning. The embedded URLs and link farm behavior suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/123?utm_term=nancy+drew+games+compatible+with+mac PDF link annotation
    • http://jobware.pro/barron_s_ielts_practice_exams_audio_cdsump4m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412380/normal_5ff480dfa0fdf.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/KjdgfoF/strike_force_hero_3d.pdfIn PDF document text
    • https://pasuwuzo.weebly.com/uploads/1/3/1/4/131438486/fidojumeb.pdfIn PDF document text
    • http://businessmentality.com/fevototoderapixeluseloru4nsit.pdfIn PDF document text
    • http://m-ryanaf.site/countif_between_dates_google_sheetsktzw0.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/78601893649rkzse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5ffe9b45e0312.pdfIn PDF document text
    • http://findssldz.xyz/52442273835swboe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_6025df0274c15.pdfIn PDF document text
    • http://nekalakizifefe.22web.org/sirejajijuxuvuvedubuwew.pdfIn PDF document text
    • http://tevojagi.iblogger.org/kbl10_bridge_rectifier_datasheet.pdfIn PDF document text
    • http://lishop.site/dj_remix_songs_telugu_wapwon_live4orih.pdfIn PDF document text
    • http://jilet1.club/najekofovuvebusedizobfmnxp.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/81e0b17b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_6019524020a24.pdfIn PDF document text
    • http://icub.tech/eia_weekly_report_schedulemxtop.pdfIn PDF document text
    • http://feedbacrnz.space/85318635845nn6i6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 5788 bytes
SHA-256: 1bb34c6a6a7ef2450e6de7553883d87d31dcab1abc0dbf4551b7dae41e78da25
font_01_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 11160 bytes
SHA-256: 326871135a9da6a13ebc699d13fc0f1a7aa10d549afd6db8b94e2943b20cde81

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