Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a6a0d755c65529…

MALICIOUS

PDF

77.7 KB Created: 2021-03-16 13:03:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4a2daae8aaf3da8b707332e4368172ba SHA-1: cb54814f0fbb64206d30dac9eb6d20e6cf76366e SHA-256: a2a6a0d755c65529f61eb59c3b005cb8d94a5c30a610a312e2a89b0f2657aa1a
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 to potentially malicious content. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing trojan. While no scripts were directly extracted, the structure suggests it's intended to lure users through these links, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=1+year+gantt+chart+template+excel PDF link annotation
    • http://fisefer.22web.org/timutuwufule.pdfIn PDF document text
    • https://situnege.weebly.com/uploads/1/3/4/5/134578036/zafabetojezuledum.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/xumom.pdfIn PDF document text
    • https://gadudomarun.weebly.com/uploads/1/3/4/7/134705140/1064640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jimotomalugeji.rf.gd/kutifenuzoriwaterupesax.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_ed9b33718290489fb8eff0d9207c4aa9.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_b44350c3a7494ef9b737ddfccbb018de.pdf?index=trueIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_9c869b5483c34989b9f8af6e87f60fd8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3849f896-ae2f-48b9-9a3b-490c564efcdb/nibanalofusijaripe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab77e337-82f2-4036-b888-7ab3acbf9464/10570609320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4406d625-4323-4573-93e7-a48c48657d0e/kipikosozalubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed5043c9-ceab-4867-a8e9-bce7af50d02e/tones_in_poems.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_e8d19e9612b54bc59c5363037392265a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8c6461-18e8-4630-be5a-b9543fd23ef2/como_saber_si_alguien_te_miente_con_los_ojos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7edea0b-3d67-42a1-9588-6ff025404fb9/navy_report_chit_procedures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d32fb76-7da9-47e0-831b-19fca7654b20/mopugesipuri.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_3c4aefca3d2645a58075909c083edbbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01bcfef0-af20-444c-aac3-2f358fa27f0f/10535017947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb22799-1b7e-45f2-aba2-132016abfc25/54290913442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ba3f8f-6701-4609-95a2-ce52f0f49f0c/is_333_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20af8cdb-8e4a-46f2-bde2-33477ad28f3d/21976523503.pdfIn PDF document text
    • http://wobudesupak.epizy.com/ielts_essay_writing_samples_band_9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 5296 bytes
SHA-256: f940df6bb70675c58cd3001f0ae3ceb676c5791136eac258833824305abc77ae
font_01_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 10852 bytes
SHA-256: 81aa12b772b392a79b736c328b04b5e5a4c150c619c352ee35f055274d2eee23