Malicious PDF — malware analysis report

Static analysis result for SHA-256 4955cc0e8c49ec90…

MALICIOUS

PDF

133.3 KB Created: 2021-03-14 20:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 4f0115376f45d6d92db042cdbe175275 SHA-1: 30bde85dc082d2cd7191089a952a6fe703d4fa0d SHA-256: 4955cc0e8c49ec90c9677a820ca75078185603077d4e40b5cde715ed25a04603
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, specifically pointing to a URL disguised as a 'criminal record check payment form'. The presence of numerous external URIs, many on disposable domains, strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and URL targets point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=diana+guide+season+8 PDF link annotation
    • http://wogamilip.iblogger.org/vavap.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/14752312474.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/pugatoworixum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494140/normal_60128aeb8c27d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_5fd9b6eed84e1.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/12528695225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476564/normal_60371147ab313.pdfIn PDF document text
    • http://votixowet.22web.org/cast_of_geralds_game_netflix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_601f5665b0a22.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://begalokatixatu.epizy.com/bc_criminal_record_check_payment_form.pdfIn PDF document text
    • http://xesidif.epizy.com/table_topic_ideas_for_fall.pdfIn PDF document text
    • http://nonepajurela.rf.gd/crafting_guide_poe_3._7.pdfIn PDF document text
    • https://61f73f4a-c6a1-4ab8-9eb3-fc3d6d019583.filesusr.com/ugd/9c43ec_0cb58b52b505453099ffb8a5d3d6a57a.pdf?index=trueIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_da85db586d334055be0a465a33e1ff1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ab85a1-27ed-4308-93bc-9c1f78c8958e/nail_salons_open_near_me_walk_in.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_d651ecceef8d4b23bcca03d2da3d11c7.pdf?index=trueIn PDF document text
    • http://poravilotizeve.epizy.com/10856400502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e5705c-081b-4988-9866-2c741a6da081/keliwizavakula.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_a9bd99ed3b064cab9998dd60e4f52647.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_off0001c044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C044 4860 bytes
SHA-256: 9e7d89c94374724c6f4429e0584ffc7f9f38945105e27c76ea0e0b319e7f19d7
font_01_sfnt_off0001d0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0CE 11616 bytes
SHA-256: 00f027999943cc81af85d19fcdf02f7f04fcdd7830211c109161f45988ce05dd
font_02_sfnt_off0001f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F82F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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