Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb75de680657c9b…

MALICIOUS

PDF

77.7 KB Created: 2021-04-01 02:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 26a49f53273c47490996fa829e761872 SHA-1: 0998a9ef2e3580afa603037ae079184af48aa2c2 SHA-256: 3eb75de680657c9bd94e646326ca8dc4b6e7a78de8177c81d5c993338d707bff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and a link farm heuristic further supports the attack pattern of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=tipos+de+lenguaje+visual PDF link annotation
    • http://xsale.trade/most_common_behavioral_interview_questions_redditumlef.pdfIn PDF document text
    • http://xomutukegadoj.mypressonline.com/92435069073.pdfIn PDF document text
    • http://kigurumi.org/fender_frontman_212r_weightguy52.pdfIn PDF document text
    • http://artyom.guru/how_many_ounces_is_a_large_sonic_shakehs1xz.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/learning_electric_guitar_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488556/normal_5fff980e67559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_6015c1bcc081e.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/vibaluxejumukuri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383136/normal_5febb3a5ac5ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_29e4b3732778440a8cb98165518a66da.pdf?index=trueIn PDF document text
    • http://lufevexos.atwebpages.com/koxubugelosovezuvajera.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/nofajivixanasanulozawow.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_5a248602f479458fb79d53d31e55b44b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/bodyguards_and_assassins_mp4.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_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 5116 bytes
SHA-256: 3229b626d562e02bea02af2def078d74cdfaeff2d16d6d1d1f1e11ed5409ea4b
font_01_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 11960 bytes
SHA-256: 47c5abbeed3d3a1f0976dd5dd38e8fd65dbf407d7118538f1afa61d90060180f

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