Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdd657a9495b9c6…

MALICIOUS

PDF

89.5 KB Created: 2021-04-16 18:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c1f2bd7e27f243e9688456dca2a28abd SHA-1: 8cb8ba8a39f8d365fb70c26ca001f3341a4c1490 SHA-256: 4cdd657a9495b9c69c8e7c3c059b3908d707812ead02edb2f571767ea4146df1
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=simple+comfort+2010+thermostat+red+light PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368736/normal_6068e8fbeeca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_604dd41bcc78c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374689/normal_6002e3b2d7c96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419630/normal_605569fc79847.pdfIn PDF document text
    • http://opensalon.xyz/zafanikizapofadetujifimgqvgk.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/xofimemaropiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462345/normal_6012587057985.pdfIn PDF document text
    • https://lisebilapuwuw.weebly.com/uploads/1/3/4/0/134096741/fuzebarujite-wemuwote-lovonitapap-lopiwutere.pdfIn PDF document text
    • http://trastenmyqort.online/17588661870zzjt.pdfIn PDF document text
    • http://mazisim.mywebcommunity.org/cmo_sobrevivir_al_acoso_psicolgico_en_el_trabajo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rorokepu.atwebpages.com/gitalofogexuxego.pdfIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_55b687dc4caa4780865988b7341294ac.pdf?index=trueIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_2709556385df4b389e482dd580ba61ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/81319560526.pdfIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_6ba9f230c62145bda1f3b91e2d31abcf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxorojero/filmywap_new_movie_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/zegebuputizanilifadotil.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/47459684177.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_c2455a8775ee427b926e3ba0dada5229.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/bonita_bpm_example.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_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 6000 bytes
SHA-256: c6da937adfd762ef7fa81b96e9282db842ab0aa7fd6a2eb8f6a4d2ee3f9b7f28
font_01_sfnt_off00012f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 11736 bytes
SHA-256: abe8820f27551a4232ea1646054b2a3fde6e3fc1360384a1db633d259b474d9e

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