Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcda488267a527d…

MALICIOUS

PDF

77.9 KB Created: 2021-03-09 20:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 83f047e50af05e310867f9f78606db94 SHA-1: b5d4d5b827c65658e6cfe094e01b351de5339d3f SHA-256: 9fcda488267a527d0e80c5115bdb6cb0cc9117d6f22a27acda480db8bcb0a365
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=jspdf+autotable+example+jsfiddle PDF link annotation
    • http://zemegazi.22web.org/garixal.pdfIn PDF document text
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/meximunorekon_gawesus.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/likenupojozo-lofosanaj.pdfIn PDF document text
    • http://ovca.space/reading_and_writing_modules13fc.pdfIn PDF document text
    • http://copyrightproblem.com/10354534693tu1qi.pdfIn PDF document text
    • http://presentinsta.site/96312537675j92yd.pdfIn PDF document text
    • https://sekugarotapoze.weebly.com/uploads/1/3/4/3/134362520/duvew.pdfIn PDF document text
    • http://antonioita.fun/mechanics_of_materials_timoshenkosf7rv.pdfIn PDF document text
    • http://copyrightsupport-ig.com/a_rocket_is_being_launched_straight_up._air_resistance_is_not_negligible1hiic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gofilafixu/sunshine_act_compliance_aggregate_spend_reporting.pdfIn PDF document text
    • http://rawuvotatu.rf.gd/43794192143.pdfIn PDF document text
    • https://28ff6ca2-2414-4e74-9e8d-c1b7aefbe223.filesusr.com/ugd/c4f63d_4efb7c7dfd93455f8048380f31fc97cf.pdf?index=trueIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_39c7660c478e405c9985f71b9ce868d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/pink_movie_utorrent_kickass.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_bea8f3dc748d42159ff441a4a8f53041.pdf?index=trueIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_df0e7a3f376a4e48813f5922324d374b.pdf?index=trueIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_d240ab26a93a432ab1f3a9c3675e55ee.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 5140 bytes
SHA-256: 26b8b7bab7284cb20ceb1ab6d31d3fbdff408aea0f9fc1c11d945382b81fe0dc
font_01_sfnt_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 10504 bytes
SHA-256: be8aa1166cb5c9ffa4317868ace3c87c29445a37e846e8f8b908de0045c4ca5f
font_02_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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