Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec73759460d391d…

MALICIOUS

PDF

72.6 KB Created: 2021-05-03 06:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a147f1839319594e9ea628e8e13b68f3 SHA-1: c4b7033651b00be64a7b657e7d764c23650c823b SHA-256: 4ec73759460d391d01604ad1363441768a4901396463be5f0dda528ddec21afb
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a prominent one identified as an SEO redirector for 'free-download phishing'. The primary URL, 'https://maypoin.ru/strik?utm_term=how+can+i+tell+if+my+deep+freezer+is+working', is likely the destination for this lure. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/strik?utm_term=how+can+i+tell+if+my+deep+freezer+is+working PDF link annotation
    • https://cdn.sqhk.co/gorusuvu/GdCgi4X/jackpot_slots_777_vegas_casino_slot_machines_games.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/jcsoJTY/frog_golf_club_cleaner.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/Xjicjbt/nfl_schedule_week_3_odds.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_2318670c27ec4ce28a80e424c9e051e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2babe078-e0d0-4362-bc8d-45ac1795744e/sijezujinavepak.pdfIn PDF document text
    • http://sazosubegus.epizy.com/antrenmanlarla_geometri_renkli.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/dizibev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f9053f-a202-4a29-810e-6d24de44122d/algebra_2_and_trigonometry_textbook_houghton_mifflin.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/australian_passport_application_checklist.pdfIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_1efe1ca01ff94c1fa361489f4748ede2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/4774523911.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/cs_1._6_multijump_plugin.pdfIn PDF document text
    • http://bupagiji.epizy.com/using_bilinear_transform_matlab.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_e9bd9555567a471ea3e66ee07ae92d70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donake/comune_campoformido_gare.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/nuvenadoludogu.pdfIn PDF document text
    • https://655b5f2c-2f45-4411-b579-7e5bd587bf3d.filesusr.com/ugd/2a272b_624ad98802584500a50111d0e33fb412.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 5744 bytes
SHA-256: aac499e2d33a9b9324e537b26059bd4896d51be40c45fb6048a9d9c0dff27eca
font_01_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 10368 bytes
SHA-256: 75a6e01545bdef2422341c03a7a9c2b1025ff06cb2dd99e6ac4326092e167c1f

Open this report in the interactive analyzer, or submit your own file for analysis.