Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c8318932d445b3…

MALICIOUS

PDF

74.9 KB Created: 2021-04-30 20:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 60baea51ddfee6c29b1cd00a742348f3 SHA-1: 50d4ad6f58bcc42e1d7f21ada3e0ba6a01fc3fdb SHA-256: b8c8318932d445b3b7af3b9bfc97829d102d2dbe126d51dbaffa8377cbffbd1b
166 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 0.9997

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://mezovuduw.ru/strik?utm_term=hp+probook+6570b+specs+i7 PDF link annotation
    • http://dorightunion.com/50038497458cui3x.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/necromancer_story_unlimited_gems65s63.pdfIn PDF document text
    • http://tugrull.com/does_jace_die_in_mortal_instruments_booksk3wk7.pdfIn PDF document text
    • https://kibopomirisusi.weebly.com/uploads/1/3/2/7/132741064/bevok.pdfIn PDF document text
    • http://xteenware.online/dodawomilegiwidalenozadiheic3.pdfIn PDF document text
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/wepawe-pewopiva.pdfIn PDF document text
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/8702333.pdfIn PDF document text
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/6229039.pdfIn PDF document text
    • http://nuneriwu.22web.org/61165970633.pdfIn PDF document text
    • https://rumunalitivera.weebly.com/uploads/1/3/4/0/134041361/6638891.pdfIn PDF document text
    • http://fepafotejidug.iblogger.org/how_to_check_normality_of_categorical_data_in_r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolilolu.epizy.com/99593041943.pdfIn PDF document text
    • http://tupudenijusab.rf.gd/apa_citation_format_for_research_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db32767b-81ad-4e98-a330-363292c10258/zebul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8855b8c4-ca7b-4bcc-baf5-2377d6730995/is_pastafarianism_a_real_religion.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/6641103418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa6a0db9-f8db-4ffc-9da8-3265feba39fc/nupedebofo.pdfIn PDF document text
    • http://puvemodi.epizy.com/calligraphy_practice_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/how_to_program_a_xfinity_xr2_remote_to_a_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/ada_ramp_guidelines_2018.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_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 5352 bytes
SHA-256: cd5debb950a4cbe58aaee69204c118f205708aeb574f9f59b93ae9ce7f536ca9
font_01_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 11048 bytes
SHA-256: 7de4e91850337f929e215b631d10887139bc18c7d070c617d7ee46178a0cd86c

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