Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0dd43886d563aa…

MALICIOUS

PDF

68.6 KB Created: 2021-02-18 14:16:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7dbf0a78467fd607ad7b64ef19b4664b SHA-1: 20e2e2dc37751df92f88be4e9c8c40dbc41403d5 SHA-256: 3a0dd43886d563aa93651a0b579a0ab7c03e389d8b81becae23d302cd2a0f335
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be a lure related to 'irregular past tense verbs list ks2'. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=irregular+past+tense+verbs+list+ks2 PDF link annotation
    • https://nufujemirifo.weebly.com/uploads/1/3/4/8/134868255/be868fd7.pdfIn PDF document text
    • https://figowemepiwe.weebly.com/uploads/1/3/1/3/131398533/98686cec4.pdfIn PDF document text
    • https://dajikunizitawis.weebly.com/uploads/1/3/1/1/131163857/29647dbf2ae.pdfIn PDF document text
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/motupavu.pdfIn PDF document text
    • https://pozemake.weebly.com/uploads/1/3/0/7/130776760/jazaseduvinu.pdfIn PDF document text
    • https://bisenazogogo.weebly.com/uploads/1/3/4/6/134686343/0df83a730e1b.pdfIn PDF document text
    • http://vizionsmc.net/apphi_post_apk2rbia.pdfIn PDF document text
    • http://vodoroding.info/63804378258gu82l.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/9852668.pdfIn PDF document text
    • http://byt-upak.ru/el_mundo_de_sofia_pelicula_descargar49y1a.pdfIn PDF document text
    • http://vulgargirls.fun/fujezudi0qkku.pdfIn PDF document text
    • https://luwusimoxoxaxa.weebly.com/uploads/1/3/1/4/131453453/7102155.pdfIn PDF document text
    • https://kamapapidez.weebly.com/uploads/1/3/5/9/135962567/9afc62f4181.pdfIn PDF document text
    • https://zejosawazir.weebly.com/uploads/1/3/1/8/131856185/babirivaka_murififikowo.pdfIn PDF document text
    • https://sozejelef.weebly.com/uploads/1/3/4/6/134600180/fa0af79a7ba9a.pdfIn PDF document text
    • http://negozio50sconto.info/assembling_and_disassembling_of_system_unit3ghgj.pdfIn PDF document text
    • http://kumorepo.22web.org/kakavigevebemadapusamuvu.pdfIn PDF document text
    • http://onesmall.space/dvdfab_10_cracka9gb3.pdfIn PDF document text
    • https://pumelagu.weebly.com/uploads/1/3/2/8/132814433/tobevimoviwuwuw_bilub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 5320 bytes
SHA-256: 88c3be894979bda03d33b0b146931bea50f973f9c1900c4cf8648e060700e14d
font_01_sfnt_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 10080 bytes
SHA-256: d3f2770847090525bb30a5f1545f94e424f3e5b2c6a4cdaecbfdf7231c9f61e7

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