Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5f58f2e7bafb30…

MALICIOUS

PDF

98.8 KB Created: 2021-05-01 13:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e1aca78a968ead8543c44f3b6ca8199f SHA-1: 7163469e6a123ada5e6dd0ca6a2e641559c9fe12 SHA-256: 8c5f58f2e7bafb30cfb1c14b8af656522129f62021863c58e7fdab50d1d4247b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://nipisod.ru/strik?utm_term=what+is+codex+seraphinianus PDF link annotation
    • http://flowerport.shop/62443629268zzm2r.pdfIn PDF document text
    • http://ig-copyrightnotice.com/viwafigufefuj53v9.pdfIn PDF document text
    • https://naketutetan.weebly.com/uploads/1/3/4/6/134660231/lulevinizub.pdfIn PDF document text
    • https://vagofavom.weebly.com/uploads/1/3/4/4/134486407/5478641.pdfIn PDF document text
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/milusirudug-vefavo-rakazu-nowavaxuze.pdfIn PDF document text
    • https://nejavolezi.weebly.com/uploads/1/3/4/0/134017816/lorixejatologegon.pdfIn PDF document text
    • https://tizonitiwu.weebly.com/uploads/1/3/4/7/134734793/kudirolikejeg-taluvigesubaw-nujakizeg-naxafeloluda.pdfIn PDF document text
    • http://hookup668.site/8292343409230myh.pdfIn PDF document text
    • https://kutekedutowake.weebly.com/uploads/1/3/4/6/134635623/68170e4558e5bb.pdfIn PDF document text
    • http://dupamineni.medianewsonline.com/ethical_case_study.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/xoxemade_pukaxulafuro_zozotirewaze_nogufirares.pdfIn PDF document text
    • https://tomosuboma.weebly.com/uploads/1/3/5/3/135382902/watimanazulol-gazuxube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b38a535f-8f23-4743-a42d-3f73bf95eb2c/where_to_practice_survival_skills.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_00a09518a1b34014a330ae7211d64a79.pdf?index=trueIn PDF document text
    • http://panexorumilogim.myartsonline.com/anlise_envoltria_de_dados.pdfIn PDF document text
    • http://zigakakedulogim.myartsonline.com/fybsc_botany_practical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5de9579e-6982-4149-8070-bc85baa1409f/wipekulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30cdf59d-e2c7-4f20-a578-880ebd35c687/what_is_enthalpy_in_thermodynamics.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_170bf5505c0f44f3a848770b110761df.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001442e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442E 5212 bytes
SHA-256: 3098a06bd20055435c4f24b1068ec0c3d62e4b7a4ee194b9dca5c7232ad98b22
font_01_sfnt_off000155f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F2 11828 bytes
SHA-256: 305dfd2de5b957863861ffb03b2f50860b208d0528cbb3822c73c88daf62872e

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