Malicious PDF — malware analysis report

Static analysis result for SHA-256 428634078ef2ceea…

MALICIOUS

PDF

82.8 KB Created: 2021-04-05 13:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f1f97bc4837c7df421ce2edcaa4c3c98 SHA-1: e8bc03262c49fc21132e0d54c28db82f2ec942e1 SHA-256: 428634078ef2ceead95b81a464ffe96954a93577eab8d5fdc97ed6c3af411be4
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 pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the structure of the document point towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://fokemale.ru/wix?keyword=kissanime+apk+latest+version+2019 PDF link annotation
    • http://tehnopolis.org/3815290865f39xf.pdfIn PDF document text
    • https://texejuzaw.weebly.com/uploads/1/3/0/7/130775796/kufefuraxa_gezud.pdfIn PDF document text
    • http://lorenbayi.com/hoover_max_extract_77_fh50230_partsvotlj.pdfIn PDF document text
    • https://lorinifufa.weebly.com/uploads/1/3/4/3/134357706/2902167.pdfIn PDF document text
    • http://brosbass.com/24596496858vlw12.pdfIn PDF document text
    • http://melifalafijuz.22web.org/609848079.pdfIn PDF document text
    • http://kir.center/26962414569hcucp.pdfIn PDF document text
    • http://dkshlyap.ru/84814424679qblan.pdfIn PDF document text
    • http://xafukuxovikovu.22web.org/77711156034.pdfIn PDF document text
    • https://judesofuvedal.weebly.com/uploads/1/3/1/8/131857090/vopepux.pdfIn PDF document text
    • https://lupilonugugi.weebly.com/uploads/1/3/1/6/131637558/9355291.pdfIn PDF document text
    • https://poxesaxe.weebly.com/uploads/1/3/0/7/130738711/5676731.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/remavuj/49116037739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162de2b9-2fa5-49a0-850a-4f413e0dd275/mcgraw_hill_education_spanish_1_workbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee986d8-f342-4fe9-ba05-ae34b7cc20b1/free_math_worksheets_for_6th_grade_pre_algebra.pdfIn PDF document text
    • https://154530d8-637b-49d0-b90a-43bf07a176fb.filesusr.com/ugd/59359a_de75887c72f746368445b10c7950eb40.pdf?index=trueIn PDF document text
    • http://vakisetituli.rf.gd/1571727771.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/lokafusopo.pdfIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_1f937af945e94fa28beddb81d5e3f56e.pdf?index=trueIn PDF document text
    • http://wuxurutigadeva.epizy.com/54712688220.pdfIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_73dca514eb1940a3b151936ef67fc2f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea759f0-ed4e-4a60-ac00-ab94cc7acff2/tosasiboxumewujasog.pdfIn PDF document text
    • http://misopipe.rf.gd/bea_miller_album.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41305c29-8152-4667-835b-f4ff78184967/1__7.pdfIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_9e4d8cc29c724b38a125803eda5a21ae.pdf?index=trueIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_47de55e60db147c89a9905b2d4132844.pdf?index=trueIn 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_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 5328 bytes
SHA-256: e7f12312f668fbb2a4b4351c9fedad87865f631fa39de888df7fbb7bffb85035
font_01_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 10976 bytes
SHA-256: a604549a37d059451f9d070e48cf569d7c4361a9259ce80e3ab8df0abfe8768f
font_02_sfnt_off00012f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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