Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1fb02ca23e4f2e…

MALICIOUS

PDF

77.7 KB Created: 2021-06-07 01:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a1aa5680f815bc125583b58d8b29dfc2 SHA-1: f87568dae6191d4fbb7f5ebd854ba5c7ab551f96 SHA-256: fb1fb02ca23e4f2ec8bdf5533f4cdb78b33d2a9b23cccea60193842cbb74501f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://crewmak.ru/pbw?utm_term=types+of+delay+analysis PDF link annotation
    • https://werakemil.weebly.com/uploads/1/3/5/9/135973214/kikab.pdfIn PDF document text
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/3115391.pdfIn PDF document text
    • https://kaxamixerev.weebly.com/uploads/1/3/2/7/132712358/2139264.pdfIn PDF document text
    • https://sebupemisopuba.weebly.com/uploads/1/3/4/7/134706320/tatibugaru.pdfIn PDF document text
    • https://dufanidozit.weebly.com/uploads/1/3/4/7/134764520/nopizasixa-mesolizo-loripa.pdfIn PDF document text
    • https://sonikegusu.weebly.com/uploads/1/3/3/9/133997348/zijowanipopaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451206/normal_606058d1e0765.pdfIn PDF document text
    • https://sudejija.weebly.com/uploads/1/3/5/3/135390998/pezanixozitut_xejumoxufoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5fd109d6bfdb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_603dee8297b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_601bb2dfecbb8.pdfIn PDF document text
    • https://matamelo.weebly.com/uploads/1/3/1/3/131384575/pevojomapip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fc9242412d97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sinorodolu.pbworks.com/f/75730621811.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/brother_mfc-j5910dw_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4865305b-743a-48b4-8359-d45f57f930e2/champion_generator_4000_oil_type.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/f/aplikasi_bypass_any_samsung_google_account_lock.apk.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/w/file/fetch/144705369/7327012862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e591cf33-9a40-4b0b-804d-505065ddc78d/55531390043.pdfIn PDF document text
    • http://zuxanoguk.pbworks.com/w/file/fetch/144712887/xigamekesupurife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51483b90-9d2b-4bf7-8a4e-98af84fcb725/92679272195.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144550857/dorabolokopaposepavoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800ca184-461e-4686-b9e6-12f02234c654/cvent_university_certification_exam_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31a59a3-2882-420c-9c65-98076bedd4d5/jesilopigamusux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 4700 bytes
SHA-256: 1b29b780dda859a784632bd76b6482100b5be54d76449cc5efff828bfac8bf63
font_01_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 10372 bytes
SHA-256: 53308f4f065a591a6da74b69ead419e880bfa2c06c2d23c22bf2aa22f9513f68
font_02_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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