Malicious PDF — malware analysis report

Static analysis result for SHA-256 907bb5b924faf5e5…

MALICIOUS

PDF

104.7 KB Created: 2021-01-17 11:22:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e4312e90a3ac0b40730532f932e529c8 SHA-1: 95bd7e861454853d2e2689a2cb48ad5b4ff06956 SHA-256: 907bb5b924faf5e5b61756a0fe6ca67988a538808ed5368c609cc8b40aee5f3b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or known malicious redirectors, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://gettraff.ru/aws?utm_term=best+consulting+wordpress+templates In PDF document text
    • https://cdn.sqhk.co/nitunoda/dghejg5/spirit_of_faith_family_church_cedar_rapids_ia.pdfIn PDF document text
    • http://xuvepawa.iblogger.org/bard_skill_guide_ragnarok.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/kgjBCia/download_game_sea_monster_city_cheat.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/ihdggz6/classic_rock_radio_stations_online_streaming.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/ig4ighh/99139892613.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/jcNGjg7/xaxikakerup.pdfIn PDF document text
    • https://site-1256539.mozfiles.com/files/1256539/sample_business_proposal_in_apa_format.pdfIn PDF document text
    • https://site-1168267.mozfiles.com/files/1168267/bts_alarm_clock_ringtone.pdfIn PDF document text
    • https://duwesokele.weebly.com/uploads/1/3/1/6/131606866/8295976.pdfIn PDF document text
    • https://site-1222450.mozfiles.com/files/1222450/java_jdk_jre_free.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
    • http://koraxirimaxodet.epizy.com/you_are_my_sunshine_sheet_music_ukulele.pdfIn PDF document text
    • http://mojebevusawibo.rf.gd/mcgraw_hill_reading_wonders_5th_grade_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/photoshop_cs3_animation_tutorials.pdfIn PDF document text
    • http://dijiwag.epizy.com/isaitamil_movies_2019_tamil.pdfIn PDF document text
    • http://nadurajamewe.epizy.com/vutulasasuko.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/d_d_5e_illusionist_wizard_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/division_with_remainders_worksheet_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/41103841787.pdfIn PDF document text
    • http://daforewepon.epizy.com/model_by_laws_nsw.pdfIn PDF document text
    • http://zekarevuwo.epizy.com/railway_empire_guide_pc.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_off00015183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15183 5416 bytes
SHA-256: 70bf7717f3057c12d4053982dfc5e4d9cc5c546757fa0c71cdd5060a7f119fa6
font_01_sfnt_off000163dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163DD 10244 bytes
SHA-256: 545726e73b3ea21b6a3a27fb9c63e4033d40bb479391947cdedb1a7298960f40
font_02_sfnt_off000186c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186C0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3