Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd511c2a28f12b9f…

MALICIOUS

PDF

87.6 KB Created: 2021-01-18 15:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 206bbcc61f96109925bb9b9c8255dfef SHA-1: 3fd368888f5fa316308215be9bb5d0a9ef86138b SHA-256: dd511c2a28f12b9f78be7cb188d11b4ae3a92984bb68aaa59d6d03e69602f0a9
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, including one pointing to 'bologen.ru', which is likely used to redirect the user to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests that the document is part of a link farm designed for malicious purposes. Although no scripts were explicitly extracted, the presence of embedded URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wb?keyword=funny%20birthday%20gift%20ideas%20for%20boyfriend PDF link annotation
    • https://cdn.sqhk.co/sisalubitot/ey8igbz/legion_td_2_guide_german.pdfIn PDF document text
    • https://site-1171131.mozfiles.com/files/1171131/ivan_pavlov_experiment_slideshare.pdfIn PDF document text
    • https://divetuguwopad.weebly.com/uploads/1/3/0/7/130739619/kegomutonenun-fapusevigorun-tosuli.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/iKhhGjj/69058821032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_5fa303671f930.pdfIn PDF document text
    • https://site-1171522.mozfiles.com/files/1171522/ffx-_2_aeon_cup_guide.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/nesemojiwovinudub.pdfIn PDF document text
    • https://site-1208753.mozfiles.com/files/1208753/94007795586.pdfIn PDF document text
    • https://site-1173627.mozfiles.com/files/1173627/b_s_a_ka_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/tizudukokeni/Phg9gMd/42017685729.pdfIn PDF document text
    • https://site-1175722.mozfiles.com/files/1175722/infection_prevention_and_control_books.pdfIn PDF document text
    • https://site-1174448.mozfiles.com/files/1174448/132163374.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5ffcd6a7266d9.pdfIn PDF document text
    • https://site-1178842.mozfiles.com/files/1178842/64715259651.pdfIn PDF document text
    • https://site-1177041.mozfiles.com/files/1177041/51155634280.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/miwolezedubujoz/pufodejaf.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/67479344063.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 5332 bytes
SHA-256: c1ead445819f03b1f26c44b687b1a64d06ade684a9e583e6344281656f415c1c
font_01_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 11416 bytes
SHA-256: 604927dc1ac1c042c4e1a9cf7f014fb63b7172a7112260fbba64fc3a8e33b831
font_02_sfnt_off00013571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13571 17764 bytes
SHA-256: 2f790cea177d8db730dcb9d588b6068f2dd6ad8cab79ef86ae00800eb7aaa48a

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