Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12844edfda27f16…

MALICIOUS

PDF

77.7 KB Created: 2021-02-18 13:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4293225dc459a11330a42d27a54170e1 SHA-1: 177385f6eb89d6e7f9c30f0c81419fa4a03b80f5 SHA-256: c12844edfda27f160aa622e03f0ad1f7ed1686ac89f4b253d32c55cedde8c693
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://druttle.ru/123?utm_term=realtek+hd+audio+manager+rear+speakers+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459337/normal_600bca3ad6715.pdfIn PDF document text
    • https://majivuwuwu.weebly.com/uploads/1/3/2/6/132683475/29d871aa.pdfIn PDF document text
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/449189.pdfIn PDF document text
    • http://max-lifting.store/vikisurunovexaezlw8.pdfIn PDF document text
    • https://cdn.sqhk.co/tuforalogidu/iegieig/sonic_gif_gotta_go_fast.pdfIn PDF document text
    • https://cdn.sqhk.co/pilimisoduk/gkgghhU/fubufuranepup.pdfIn PDF document text
    • http://daliadiago.com/because_of_mr._terupt_full_book2kkxl.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisoritet/ii7Yhtz/idle_dungeons_guide.pdfIn PDF document text
    • https://kuwomodelinero.weebly.com/uploads/1/3/0/7/130776449/6614257.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/65064972847ox1wm.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/jenisozazewubo/diary_of_a_wimpy_kid_rodrick_rules_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/ridigovezabetezuzedewowo.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/cahier_de_charge_audit_securit_informatique.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_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 5536 bytes
SHA-256: d3482b4d9e34d2f43abf2cded096eb87118d0f9b09fee22d7398e7cce2eea488
font_01_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 10472 bytes
SHA-256: da10ed037f0cb208d470aaa1efbd204f0aa8c8651009ffc4db66cdfe18157c2f

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