Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbf8a7cf783bce4…

MALICIOUS

PDF

70.9 KB Created: 2021-05-23 08:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1e119bc2347c78137862406c4301b902 SHA-1: 76dea4a1ee895dae83db2c06fb7f9fc3ce69cca1 SHA-256: 3bbf8a7cf783bce4f7b62bccd696cc5b9fd2d458d934fe041c20b60752973ccf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically identifying a mass of external links. The embedded URLs and the nature of the heuristics suggest the primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=maahi+raaz+2+mp3+download PDF link annotation
    • https://bonopabugo.weebly.com/uploads/1/3/4/5/134581776/a7381d471f.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/navimezi-jexew-mopiwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_6017c31850eb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_603847b9cd999.pdfIn PDF document text
    • https://ganepivojo.weebly.com/uploads/1/3/4/7/134774155/tulesexebobamekeb.pdfIn PDF document text
    • https://dalatomim.weebly.com/uploads/1/3/4/3/134344090/7196639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416671/normal_605518d8abae6.pdfIn PDF document text
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/vefinogovosok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391008/normal_5ff65c2e65d8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_5fd6f500319ba.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/8446140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5ff2c696a737f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476782/normal_6067ce86b2f4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_600b4921c161a.pdfIn PDF document text
    • https://monoxoni.weebly.com/uploads/1/3/0/7/130738852/042b60f7b248f3e.pdfIn PDF document text
    • https://nebofubegifeso.weebly.com/uploads/1/3/1/4/131437549/f023fbc93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_6015a2c56c9e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_6012846a7a5c9.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/9e4f5d67-3219-457a-bbd7-901d4b240653/27276143278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e645f29-6019-40f6-951d-2a987929c737/highway_safety_manual_crash_modification_factors.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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 5464 bytes
SHA-256: 25d345b2a31168aecd7732cf79de8cef6e38d7ec14ecf6aa676bbdcc38cd2a42
font_01_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 11556 bytes
SHA-256: f81d5a6647566c5785279728646b2e3b3af8327f420ba615d972097c9f7f442f