Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8243c24556b459…

MALICIOUS

PDF

86.4 KB Created: 2021-04-07 21:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bc23235a5f1ba9b23202de245ebb18f1 SHA-1: a8955d4a3d1a9cb7b64966699f9ec8cc03d86cdc SHA-256: 0d8243c24556b4595250fe4ed47a871e731428f8729f835ac4050e9c6bb0e3c9
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, appears to contain keywords related to a vacuum cleaner belt, suggesting a lure to a malicious site for potential credential harvesting or further payload delivery.

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://gimoguvi.ru/strik?utm_term=hoover+windtunnel+rewind+vacuum+belt PDF link annotation
    • https://cdn.sqhk.co/mezutowede/idZajew/android_radio_wireless_carplay.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/hjja001/messenger_lite_apk_download_old_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_5fd2c3a8cb379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485580/normal_60017c79448aa.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/ehccZaU/dora_and_friends_games.pdfIn PDF document text
    • http://wokokijup.iblogger.org/comal_river_flow_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2ba8ab26-b6ca-45ad-a005-d08174b12f0a/object_oriented_analysis_and_design_text_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5233fa09-f1b0-4e99-8cfc-44a6dac9316d/how_long_can_baby_use_chicco_keyfit_30_car_seat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24fee29b-e573-4a49-be5b-369159cc9867/33696487170.pdfIn PDF document text
    • http://dufodowume.epizy.com/bivupuronav.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/nowexuru.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/jerus.pdfIn PDF document text
    • http://xevorerokune.epizy.com/amazing_grace_chords_in_d.pdfIn PDF document text
    • http://vubimefiz.epizy.com/dungeon_master_2_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6724ec-bec0-4292-ae2a-9acdb82cf7e7/waxugorobejoso.pdfIn PDF document text
    • http://nimitijas.rf.gd/au_bonheur_des_dames_roman.pdfIn PDF document text
    • http://zaxawogaxema.epizy.com/dr_babasaheb_ambedkar_video_song_dj.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_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 5044 bytes
SHA-256: 6cf1bdf79928d8e50aa97ec8ac0a2574cac544cc3d83c6e101f6b5034634235e
font_01_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 14276 bytes
SHA-256: 10dbe2aa2c155c5edc95deb43d446de80c0abd8d892d9a6f098a304c994d89a1
font_02_sfnt_off00013ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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