Malicious PDF — malware analysis report

Static analysis result for SHA-256 68cd77508837ad0e…

MALICIOUS

PDF

78.7 KB Created: 2021-03-10 21:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: baab995a415c151025de0fdc616a816f SHA-1: 739a3bf9488037bac62a7f7e4005821ece214fd1 SHA-256: 68cd77508837ad0ee22e0c7397c165fc88479c6fd79a8c68d005f094dabe9885
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=app+bazaar+apkpure PDF link annotation
    • http://bioforcecolumbia.site/radilifonitufonogge7fn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5fd6b26f0ddce.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/rZjgggc/tulupasinila.pdfIn PDF document text
    • http://blancop.xyz/rusutulozafybidc.pdfIn PDF document text
    • http://hihikane.space/captain_underpants_moviecogro.pdfIn PDF document text
    • http://autobuff.xyz/manual_de_edafologiaxebk5.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/robert_frank_the_americansw0l0e.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/iawfoje/85065719221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_602776be9116e.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/13361475210lxxpg.pdfIn PDF document text
    • http://badge-verification-center.com/les_miserables_broadway_musical_songs6977e.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/gdifhcJ/duo_mobile_apk_for_android_5._1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0356326a-640e-4711-9cfa-03c5f892bf46/lowofuzad.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/kadulabesibebimazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/090e3254-951f-413b-a4fe-230edbf81414/snow_white_with_the_red_hair_ending_manga.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/sba_fact_sheet_hungary_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/meade_telestar_ds_114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96cd40ab-1f0f-4e36-b953-7b4f28c0dbb6/what_are_the_different_types_of_literature.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/vidmate_app_er_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/kaz_personal_mist_ultrasonic_humidifier_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92693c2-4d7c-4729-8e1e-ad49e55d4a10/niwovivefu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010d50.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D50 19676 bytes
SHA-256: 66ed585d858d1caddb0af6fd8e389d70139b348aa4dd37e2e28cae1375e07a0d
font_00_sfnt_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 4848 bytes
SHA-256: ff586befe2a75877de1f0d5a687dd2a8091d11da9c752a4345503d22063e11b3
font_01_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 11144 bytes
SHA-256: 7e826770927fb3d8b284011cb6240da1fe8e4ac451e4ea4f5a0045f578031f30