Malicious PDF — malware analysis report

Static analysis result for SHA-256 526a122e7f9b0425…

MALICIOUS

PDF

75.0 KB Created: 2021-03-05 10:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5d0507e65530ecdd1cbb8fc00be34e3c SHA-1: 8cea60c18df455b82f84bdade22dab802231f659 SHA-256: 526a122e7f9b0425d4e302e448592eeaf52b757dd6dd7fa182489d027b2f1a8d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/aws?utm_term=history+of+the+bible+canon+pdf PDF link annotation
    • https://suwisabinupa.weebly.com/uploads/1/3/5/3/135351097/pinezanutujobepat.pdfIn PDF document text
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/5834121.pdfIn PDF document text
    • https://taxusuxegob.weebly.com/uploads/1/3/3/9/133997122/xonuvitofuro-teveratukovas-luwuwoz.pdfIn PDF document text
    • https://safipeta.weebly.com/uploads/1/3/1/4/131408280/vesutafurev_jiloxadokaputa_mavugu.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/sopekefog_minogexepuxekos.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/hOhjnjd/pileru.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/jdgdhgf/today_fox_news_live.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/geggijl/biker_mice_from_mars_toys_vinnie.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/jGyhct2/bokogajomut.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/Widijia/faxoxozaxirureru.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/f0413c.pdfIn PDF document text
    • https://cdn.sqhk.co/kimokajuz/fwhhJig/kozilijejiman.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/icihdhk/nifurimujodaxarubomon.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/4537912.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/hjdbjhu/81916322906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e318973d-9ab2-4b9b-8bd6-04d044b4abb1/clasificacion_de_derecho_objetivo_y_subjetivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6cce96-3b18-41ce-953b-0f30a112c8d7/public_relations_job_salary_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15da7f32-a474-419b-a787-075e15636067/mavivedafigetujig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e5eaae-48f1-4986-837d-7bfb3a90627b/tigedagetelemexajojujoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b8dbe6-e342-4823-ac62-e0ef0be41191/18810659537.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_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 5444 bytes
SHA-256: bd82057f6a2335da44c952df8896de832e454629beeb2442b83e085152db8056
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 10184 bytes
SHA-256: 33c7a560c5e0952cc8206536c2667f31c1e66ecb879a1f25305b2879863bb2b6

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