Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b412726e5da55c…

MALICIOUS

PDF

123.3 KB Created: 2021-02-14 12:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 41982a63be342a3a917b14061744810a SHA-1: f7d45115885e72a5aeaf6051e6a5b247df16ad5e SHA-256: 96b412726e5da55ce022b89a3d2f4b65702d2642950bd0b08e3c262512cc5149
126 Risk Score

Malware Insights

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

The sample is a PDF file that contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of external URIs and the heuristic for link farms suggest the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Malware.Agent-9978882-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Malware.Agent-9978882-0
  • 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://maypoin.ru/123?utm_term=paracelsus+theophrastus+von+hohenheim PDF link annotation
    • https://cdn.sqhk.co/muwazubivotu/ciiUzjf/disney_crossy_road_hack_apk_all_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/aAgisqS/zufoxunaxubitedudofukam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490133/normal_5ff5e9e758246.pdfIn PDF document text
    • http://love-cosmetics.shop/jennifer_ann_pornmdejy.pdfIn PDF document text
    • http://3203epworthcres.com/batirug15zp.pdfIn PDF document text
    • http://klokisik.space/darobajigerizoogd1l.pdfIn PDF document text
    • https://nopirepogoduk.weebly.com/uploads/1/3/4/0/134095858/kodugizazosu-pilemafixolo-mexupinuripo.pdfIn PDF document text
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/pekisiti_zebawu.pdfIn PDF document text
    • http://lisolu.org/ciclo_biologico_chagasuqkwz.pdfIn PDF document text
    • https://nusupubibirimu.weebly.com/uploads/1/3/1/8/131871553/vuxupaven.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446774/normal_5ffaaa4eab3f0.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/dHQijye/jedamokexijafimimal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/lean_six_sigma_white_belt_answers.pdfIn PDF document text
    • http://ximogubofew.epizy.com/46822630558.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_off0001a2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2C0 5232 bytes
SHA-256: 683ee43d80e35f04a7255ce3f6194fce476f24a419eca54fd59103283fa8737f
font_01_sfnt_off0001b46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B46B 13324 bytes
SHA-256: 09d9adc109fc8ac476f64d13a25c15bcc89e1023d17e35bb971d8357ae6ebfc8

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