Malicious PDF — malware analysis report

Static analysis result for SHA-256 153975dea63b8cd2…

MALICIOUS

PDF

82.7 KB Created: 2021-03-30 23:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7b32c04d1ba27321ff29411bbff67006 SHA-1: 023302aa668f730e133ac7b728cf6cb2f2fda803 SHA-256: 153975dea63b8cd2a1ab9a2f09d1272e2a028227f1058306e58efe42a7c6f344
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'xezojetit.ru'. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests a link farm designed to redirect users, likely to a phishing or malware site. No scripts were extracted, but the overall structure and URL findings point to a phishing or credential harvesting attempt.

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://xezojetit.ru/wix?keyword=centennial+hall+umn+review PDF link annotation
    • http://nukicew.xyz/xexavakitorijabumekexum1iez.pdfIn PDF document text
    • http://websporizlehd.com/true_colors_movie_trailerbdb9x.pdfIn PDF document text
    • http://stopro.store/can_i_use_iphone_as_samsung_tv_remotenx403.pdfIn PDF document text
    • http://lenorimageb.iblogger.org/marathi_cartoon_video_songs_free.pdfIn PDF document text
    • http://ihsteam.ru/allen_ginsberg_reads_howl_and_other_poemsngm6q.pdfIn PDF document text
    • http://cafechorsu.ru/winter_wedding_table_decoration_ideaso09if.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/1f998429-6821-4877-9bd4-a2b7a5434211/tinifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52168f65-8eb9-4967-ac41-6ea65fed090f/wusuxedowe.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/55615403340.pdfIn PDF document text
    • http://bofawujataja.epizy.com/the_little_red_hen_printable_story_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/681b134d-82fe-4b7f-85ae-dda924bcc02d/23001696573.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/golds_gym_trainer_410_treadmill_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e55222d-2a61-44fa-bc34-74d9fb26f98a/8819486970.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/ballade_pour_adeline_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/worldview_4_satellite_imagery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f48419-8aad-4b22-8a3e-b58aaed2573b/tidesako.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/2892064752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58d8d38-7641-442c-9a19-c3767b841618/yamaha_yz250_service.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/21419790344.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/85990038037.pdfIn PDF document text
    • http://voices.yahoo.com/university-minnesota-hoIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 4804 bytes
SHA-256: 004bde4bdb3a226af59b8c71c4df4765915a9c357a50bb537ca542af00b7d580
font_01_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 10336 bytes
SHA-256: 68a750bf481135600cd0a25f6097f8af7692500a9dc4e1b3ac6882184d97f785
font_02_sfnt_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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