Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b97820a438b737…

MALICIOUS

PDF

71.9 KB Created: 2021-03-29 02:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4e479013b3b61c5e1529261fb54d0cfa SHA-1: c09fba8913f93514aef60fb42ec9026a9d80587a SHA-256: 48b97820a438b737aa4daf5952940fe4ea71c822460f59faa75eeb7fb6e18793
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ClamAV as 'Pdf.Phishing.Trojan'. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains references to 'Mii maker citra rom' and 'wkhtmltopdf', suggesting a lure to a potentially malicious site like 'bologen.ru'. No scripts were extracted, but the presence of external URIs and the phishing detection point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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/wix?keyword=mii+maker+citra+rom PDF link annotation
    • http://sodalabs.pro/66682591579cgc0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_606027f49b88d.pdfIn PDF document text
    • http://vanlit.ru/nixuzikotewekaferojapirj7n8q.pdfIn PDF document text
    • http://tcerkovniekupola.space/kudinebegekazaxebipelgdh.pdfIn PDF document text
    • http://vodenupomotafi.22web.org/catalytic_naphtha_reforming_process.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://copyright-notice-ig.com/30130616418rw9pl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5fd33b927b0c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_5ffed528e70bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_603b4e3911c14.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
    • https://s3.amazonaws.com/fifuto/28942312991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65a2e47-3ef7-4d79-a574-71f855471396/vebaj.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_0858d6864df74a5b8e2e3156164daba9.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_8ba85adc7b9e4a86ba86262c83caac74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safago/nivinokugibivenozufibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f96375f6-9444-48a8-ac2e-ecefec86c536/poganemodiviwu.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_c780a5fd3b634aedba4d4e57874505d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64331627-365f-4bc4-ac26-e77e503b6e54/what_are_dork_diaries_books_about.pdfIn PDF document text
    • https://dc5983eb-04eb-4341-be6e-5f763cf8c8d0.filesusr.com/ugd/979c04_51e6d6ef7e994e19a96c109f968638f4.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_7675936c670e4e01ab79c78589067d6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f60657dc-d194-4194-bfac-47196f120416/sobitizos.pdfIn PDF document text
    • http://vewajelawukos.rf.gd/7160477944.pdfIn PDF document text
    • http://netixoxolasabo.rf.gd/32948680685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c2d8a3-187e-4a95-9c14-8ae198f1b816/60431888441.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_off0000cfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCB 4488 bytes
SHA-256: a8bd084d3338286a0bd5d06e8e9d06eec50a7c4ce652f38522c6511599c8115a
font_01_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 10508 bytes
SHA-256: c104503cc080a44977f1f2529b02a8251e4dc5a1ad2ecf9997457e65f9444069
font_02_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e