Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1764c29ea69a55b…

MALICIOUS

PDF

75.9 KB Created: 2021-06-03 01:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 82ef4a17bb67035c00a1e54164811927 SHA-1: 90d761f97566d3675c0896061a8df4270a13a618 SHA-256: b1764c29ea69a55b3085796710ad123b277343026d06b37af2df3644c8a42eba
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with at least 30 distinct URLs, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs points to 'bologen.ru', which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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/123?utm_term=burnout+drift+2+mod PDF link annotation
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/pisev.pdfIn PDF document text
    • https://xetudutadoboja.weebly.com/uploads/1/3/4/3/134344850/kudixegibizel.pdfIn PDF document text
    • https://neluposu.weebly.com/uploads/1/3/4/3/134369170/vaxavipadaxa-nunusojewalonun.pdfIn PDF document text
    • https://fanamariruzatad.weebly.com/uploads/1/3/4/5/134514157/f6b694c51f9abec.pdfIn PDF document text
    • https://nawiveburejofi.weebly.com/uploads/1/3/1/3/131381882/9826729.pdfIn PDF document text
    • https://vururera.weebly.com/uploads/1/3/4/4/134493513/derovivano.pdfIn PDF document text
    • https://rusokakes.weebly.com/uploads/1/3/4/0/134016884/jusujeliwedefaz-dikopuzufajij-bomumuzozusuwu-vabimukite.pdfIn PDF document text
    • https://papowovuli.weebly.com/uploads/1/3/4/0/134040392/8677482.pdfIn PDF document text
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/pafibapesiwumu.pdfIn PDF document text
    • https://zedabobosarafon.weebly.com/uploads/1/3/0/8/130813357/kesigepavagufa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144460629/substitution_and_elimination_practice_problems_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58cbb44e-7371-4908-be27-8de44930452d/56401556704.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/87037410769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23ffbc8-6419-4987-a713-d98b234e984f/livro_adestramento_de_ces_grtis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/013ce7ef-14aa-4334-83e1-7123fe32d357/butobasiwefetomumatu.pdfIn PDF document text
    • http://felefejimax.pbworks.com/w/file/fetch/144521433/bts_world_mod_apk_unlimited_gems.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/w/file/fetch/144517941/ziduxekesodevuzi.pdfIn PDF document text
    • http://pafunanukexe.pbworks.com/f/what_are_the_i_iv_and_v_chords_in_g_major_scale.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144530013/82754916672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c705ccb-6c71-4853-9222-2f68cdc9cf2b/jimuzasijujedebuxezoni.pdfIn PDF document text
    • http://fevawigo.pbworks.com/w/file/fetch/144420981/56031541663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852bb2d0-72cd-4c19-8fe1-a508f7730d79/living_with_the_himalayan_masters_in_hindi.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_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 4812 bytes
SHA-256: 1bca418b7b347e3bb4bb56762b4bcee980259667d7cafac8e2a6cbfd05e64b8c
font_01_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 15292 bytes
SHA-256: 224d1c8806fe6e9be2fcc06bd28ce9e2adb9891df22e25f1d657ec158c6adf5e