Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28e51b4c4015ba9…

MALICIOUS

PDF

83.0 KB Created: 2021-04-08 06:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7f3104b2f17d9047afc3645232ea0fdf SHA-1: 06b067e3f100a8c77908a45650112ecb37608686 SHA-256: f28e51b4c4015ba9a17ac1e76d48fb7669fceb7ff371b826a9aa7ba90bc37d7d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm or phishing operation. The document body, though partially corrupted, contains a lure related to removing chickenpox marks, directing users to a suspicious URL.

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://kuzutuzo.ru/strik?utm_term=how+to+remove+chicken+pox+marks+fast PDF link annotation
    • http://xokebidukefu.getenjoyment.net/gojano.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/5a849.pdfIn PDF document text
    • https://figokafudifugi.weebly.com/uploads/1/3/1/3/131383964/nukajuw-voxilodavij.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/73d62c.pdfIn PDF document text
    • https://sinidagiritab.weebly.com/uploads/1/3/5/3/135386058/6652763.pdfIn PDF document text
    • https://fesalepexixid.weebly.com/uploads/1/3/4/6/134660072/powubomepawavevulu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_e943870453ec45b1a12334bfef313887.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f7f7649-aa9d-4e46-944d-6273c715544a/50478883069.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_2bd56ab40b44452989d89bd9ffd1c022.pdf?index=trueIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_aec943a384084f08b0e13b20062b8b48.pdf?index=trueIn PDF document text
    • http://tagijonegularol.myartsonline.com/conjunctive_adverbs_quiz.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_eca9f3bc9dba4e06babf33c2cd59e741.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48ce8b1-574d-4f34-abb0-c8e0533371db/gajejeni.pdfIn PDF document text
    • http://nexuvojof.epizy.com/recruiting_email_blast_templates.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/personal_branding.pdfIn PDF document text
    • http://fibalikirikoti.epizy.com/constructing_congruent_angles_worksheet.pdfIn PDF document text
    • http://jufofokisib.epizy.com/59324288367.pdfIn PDF document text
    • http://bawatusarab.epizy.com/free_journeyman_electrician_study_guide.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_d9c8e20a604d423f8d856fde55a8b07f.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_b3aa33b85de242a696f39c1987f889ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca9b8a8-e4b5-440e-ad67-a8580675c2c4/how_to_improve_phonological_processing.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 5468 bytes
SHA-256: 3e36f18424700c0a99d3da8904872b387d48016cec94549e49ff924636a9da7b
font_01_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 10504 bytes
SHA-256: 6736f9781a32941d97fe164f3ea06ec7c1de2ba98e0b02a6fce8d6cb3dcaadf8
font_02_sfnt_off000128c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C6 16396 bytes
SHA-256: f573881c3c2e6f39e1bf537652a1ab786be642ca38f3237d8f1e2138848f093c

Open this report in the interactive analyzer, or submit your own file for analysis.