Malicious PDF — malware analysis report

Static analysis result for SHA-256 5030785ac7aacec7…

MALICIOUS

PDF

79.5 KB Created: 2021-02-11 01:12:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 64637430c926787ac6f164bfdc8ab454 SHA-1: a3b96096ed9636e5d6bd7bbe4e9dea616c2387df SHA-256: 5030785ac7aacec7b7a44609607f709a7683636c5b07923990579a3874dd2604
126 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or a distribution point for further malicious content. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting further support this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://bologen.ru/wb?keyword=chemical%20quantities%20review%20sheet%20answers PDF link annotation
    • https://perepori.weebly.com/uploads/1/3/4/0/134016710/2fdd5005100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_600d2f607b95d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477651/normal_5fe143ae8672c.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/Phh4ich/81953224880.pdfIn PDF document text
    • https://megefutuw.weebly.com/uploads/1/3/0/9/130969536/xolil-nevasasobubomif-ziwelerozejujof-vovatikuxivun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500889/normal_5ff623a900741.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/zubaporotipa-dozuvijotalutep.pdfIn PDF document text
    • http://setifol.66ghz.com/30241242301.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/4379472.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/0Ogdgjg/jikigapixigamegexen.pdfIn PDF document text
    • http://ginononujex.iblogger.org/adcirc_user_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480399/normal_6022846acc6c2.pdfIn PDF document text
    • https://cdn.sqhk.co/fajixojemom/Aicihid/vikings_game_recap.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxixeg.epizy.com/12759666893.pdfIn PDF document text
    • http://sivigowukom.epizy.com/bozuxutenilizapifumomam.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/fuvuwupinozefi.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/java_7._2_64.pdfIn PDF document text
    • http://ditiruvovuluka.epizy.com/28297388231.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/70603139227.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/2016_bmw_x3_xdrive28d_manual.pdfIn PDF document text
    • http://keberefan.rf.gd/nazakijobagutogedaja.pdfIn PDF document text
    • http://rusilip.rf.gd/estimate_decimals_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/gout_treatment_guidelines_acr.pdfIn PDF document text
    • http://sisuraregimu.rf.gd/android_tv_airplay_app.pdfIn PDF document text
    • http://gakinodimojulat.rf.gd/61193297540.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 1724 bytes
SHA-256: 1af1fdb02f150e4b7fb9ab825036f356033ef8d1f6adfeb519aebbff9637efeb
font_01_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 5220 bytes
SHA-256: 9a373932d8bf4efcb7c6c59fac31906e2eb0baba71edebd415bdd1d36ba0e574
font_02_sfnt_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 10720 bytes
SHA-256: 23c329a836f72582dd622d36ad9850180c9909a4809fc2e758fc77236b155d91