Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcd55166225a221…

MALICIOUS

PDF

77.4 KB Created: 2021-04-25 21:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8a1192b031c6c64f671908370b27a78b SHA-1: 2019ec14313cce4b0d79cc7f903a99f028a8c605 SHA-256: 6bcd55166225a221f623ec76b7c2ff78d6c0f7fbf3592f08def51bb3d12f638a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the nature of the embedded URLs point towards a phishing or malware distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=yamaha+stagepas+600i+price PDF link annotation
    • http://gabutetidik.22web.org/good_food_guide_awards_2020_brisbane.pdfIn PDF document text
    • http://mebel-albero.ru/is_tokyo_ghoul_season_4_the_last_season59c17.pdfIn PDF document text
    • http://detonic-deutschland.website/australian_gluten_free_foods_list06f0n.pdfIn PDF document text
    • https://cdn.sqhk.co/pabilere/jSViage/notununulataxifubabepulug.pdfIn PDF document text
    • https://xexifenenufomag.weebly.com/uploads/1/3/6/0/136082553/8960400.pdfIn PDF document text
    • https://zowatiloni.weebly.com/uploads/1/3/0/7/130739934/rukuwelabedax_ladez.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/povexifeluze.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/harjeYK/37539951596.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/1hfPhbP/carrie_underwood_concert_2019_song_list.pdfIn PDF document text
    • https://tagekoworiz.weebly.com/uploads/1/3/4/0/134016686/2346959.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/ad4f21dfac921c.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/cDifwhd/72940417611.pdfIn PDF document text
    • http://takovod.66ghz.com/furafize.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/XhegiBB/stress_management_tips_for_students.pdfIn PDF document text
    • http://dilofab.22web.org/zisomete.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetuvab/igieVhd/mikecrack._exe_mata_a_los_compas.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/7711e8f0-9bd1-4022-90df-c99270c5dcf3/is_there_an_app_that_can_solve_math_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae909fd1-6d04-4797-9671-0140a9db452a/iron_man_glove_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6c2888-9455-4feb-90ad-6c6aecdde390/how_to_pair_a_plantronics_c054_headset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de7837a-78c1-4648-a5c6-8a52635a7685/my_license_says_not_for_real_id_purposes_nj.pdfIn PDF document text
    • http://bajewilogofiro.epizy.com/livikuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b08f32-8570-46ba-b51f-8cac992188d3/65744223426.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_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 5572 bytes
SHA-256: 810de17fa6d1ea54aa8b8ea9be62a7c3d0bdfe8274c55eaf969f2c0991b4c25a
font_01_sfnt_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 11628 bytes
SHA-256: 7d82cefc53e090f52fca92df218fa915414c48f41a75d31eeeafcadbc5a0a16a

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