Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a2ae10ea5678c3…

MALICIOUS

PDF

67.9 KB Created: 2021-04-03 21:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7e612c3af08fda3c00375a79914b1c1b SHA-1: 0038aec9c611e0e561f09f71ec69f54e05d78969 SHA-256: 09a2ae10ea5678c3d8351db47d0cc39f41410f751eb2c68bceea39e44796986d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, particularly the one hosted on 'pelibifir.ru', suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious documents designed to trick users into visiting compromised sites.

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://pelibifir.ru/award?keyword=ocean+animals+reading+comprehension+worksheets+pdf PDF link annotation
    • http://zonerokemub.getenjoyment.net/past_simple_regular_verbs_exercises_with_answers.pdfIn PDF document text
    • https://govodiroruje.weebly.com/uploads/1/3/0/7/130775462/mexajez.pdfIn PDF document text
    • https://fekanarikivokil.weebly.com/uploads/1/3/4/8/134884633/636791.pdfIn PDF document text
    • http://dopenukivo.22web.org/10343132431.pdfIn PDF document text
    • http://wonizojaru.scienceontheweb.net/fegezos.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/the_essential_federalist_and_anti_federalist_papers.pdfIn PDF document text
    • https://jejenovo.weebly.com/uploads/1/3/1/4/131454593/9069706.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/6f1c9356beacb42.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/101c29ac508a271.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/dubiditiginowo/empyema_pediatric_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/thrive_themes_architect_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c265bfea-a643-41d3-8433-01afedf97215/19168993044.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/13678703362.pdfIn PDF document text
    • http://fenulujexita.epizy.com/evenflo_sonus_65_convertible_car_seat_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/asset_management_job_description.pdfIn PDF document text
    • http://wumekupewug.rf.gd/canon_600d_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b17442-a393-4669-9efe-ac9b798c2a6c/how_to_make_avatar_in_photoshop_cs6.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_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 5752 bytes
SHA-256: 3ec451157f629e9896b4ce24a72519b62c635666d24cbcd85a566de0e6c46766
font_01_sfnt_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 10296 bytes
SHA-256: 5e50f08a13b77ea088af6d58d1e52b513dba1046f6ae8ea253b5f02c6bbdd63d

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