Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbac59c8ddefb496…

MALICIOUS

PDF

87.8 KB Created: 2021-02-22 20:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 13cf3a92f84ea3950a5c624d4e1c51ad SHA-1: d3a93f39de55570aa24b90d741eec1f645dbe9f5 SHA-256: bbac59c8ddefb496a95fae09d9dbb372cda819329ea7f8cecb4d29d14f0136d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with several pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=cost%20to%20charge%20mini%20split PDF link annotation
    • http://sofebitaxed.iblogger.org/imf_bentham_limited_annual_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490534/normal_601d63b18ce1c.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/gridP1H/real_football_2015_download_java.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_601b1e3f48d6b.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/sPf4hbP/zombie_hunter_frontier_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417141/normal_6000049a407b8.pdfIn PDF document text
    • https://dizogesutupini.weebly.com/uploads/1/3/4/6/134631076/kobukodazavegivexi.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/hgjcKgg/xuzokevapelaxanadolejap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371266/normal_5feeca2b167fc.pdfIn PDF document text
    • http://bixuvetojotenes.22web.org/77663387899.pdfIn PDF document text
    • https://lawebigatu.weebly.com/uploads/1/3/1/4/131453175/kudubar.pdfIn PDF document text
    • https://wexanamu.weebly.com/uploads/1/3/1/4/131411474/vudozatumab_dovedifumega_pugezoguvovuti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485448/normal_5ffd7141e459f.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/rutufokedizon/69345704240.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/18706510414.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/harris_county_district_clerk_civil_information_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/braun_series_7_shaver_user_manual.pdfIn PDF document text
    • http://nafufejuk.rf.gd/food_safety_guidelines_for_sushi.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_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 5252 bytes
SHA-256: c7a0d4df59a896714483e811648c879f2bac58f76e5336c6db1af25edf12cb8a
font_01_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 12164 bytes
SHA-256: cd5aff5a3c7d95ad61ea8bd94f3b546be0c449f62d8f076be1904b9874e70410

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