Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8fa5bc739bb931…

MALICIOUS

PDF

78.6 KB Created: 2021-04-29 21:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 92f149a2d8609195a8fe0405215ac21f SHA-1: ae8ba2df3adf0c3370e1a745deef412f8c5b18ef SHA-256: 2e8fa5bc739bb931c3b064dfdbcb88abb11d489be38ee08dc40004c5b6891147
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, highlighting the use of numerous distinct hosts and UTM parameters for tracking or obfuscation. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://kuzutuzo.ru/strik?utm_term=unix+shell+script+if+statement+syntax PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5feea2a3e850e.pdfIn PDF document text
    • https://latezuletarok.weebly.com/uploads/1/3/5/2/135298634/4931098.pdfIn PDF document text
    • https://sasasazar.weebly.com/uploads/1/3/1/3/131383954/vebotefevosona_disija.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/KlJKibY/balenciaga_hourglass_bag_red.pdfIn PDF document text
    • https://cdn.sqhk.co/zozusexub/pihawjj/commercial_electrical_load_calculation_worksheet_excel.pdfIn PDF document text
    • http://dazavaluk.mygamesonline.org/75843359309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_6047407a04200.pdfIn PDF document text
    • https://tikivumisa.weebly.com/uploads/1/3/5/3/135346314/xomilu_zuviwoxezaviv.pdfIn PDF document text
    • https://cdn.sqhk.co/modebopogut/hgiBhaj/34770677535.pdfIn PDF document text
    • http://sadogiropi.mypressonline.com/52422760228.pdfIn PDF document text
    • https://golurivuj.weebly.com/uploads/1/3/4/7/134744385/jumib_xebujavefusuba_fegeweka.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/xPEihgh/oklahoma_state_football_score_live.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/2012_jeep_grand_cherokee_srt8_0-60.pdfIn PDF document text
    • https://cdn.sqhk.co/nujizeres/ieigrgi/slide_away_oasis_lyrics_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_602639c294b6a.pdfIn PDF document text
    • https://nowigusoludi.weebly.com/uploads/1/3/4/2/134266380/4346228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500904/normal_603cbf4135f22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383679/normal_5fed2c0ce8def.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/51036337527.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/kenmore_range_igniter_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/70469095624.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/13306468222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d41881f-b456-44a9-a174-a77dba5c6242/adt_scw9057g-433_battery_for_security_alarm_panel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c987354c-63a3-41c7-ba4c-0df94ed5abd8/pl_sql_loop_over_select_results.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d153fd-578f-4e72-8d12-b0ad8de21700/samsung_s4_mini_price_in_sri_lanka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b75a6c45-c9ec-492a-ba4f-6e93c7e35005/lixegis.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/diwinenezepepoxigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb0d1641-ae16-42f6-81ca-be5a54a2e2e5/39377248173.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5416 bytes
SHA-256: 356dcbc0b226a67dcb740e331bd87ad7be6fd2daa7e09dd36bcdc6dcd2bab752
font_01_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 12136 bytes
SHA-256: 4e9439dd35a669d2b07015c07638efb53cab0b57dd693771f69e84fee464f7f8

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