Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05d5358722413d6…

MALICIOUS

PDF

77.9 KB Created: 2021-03-07 04:48:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 74003cde797a3078a708f5df6a804cf0 SHA-1: 3794674e7e19fbef72666111916ce2ac15af744d SHA-256: f05d5358722413d6ef910acb7e95dba42dd45f7f3ad80c93a8da31fe7d19f142
186 Risk Score

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 0.9992

Heuristics 6

  • 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 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://jottigo.ru/wix?keyword=vivid+seats+skydeck+review PDF link annotation
    • http://womenit.space/xuxukavonup7crz3.pdfIn PDF document text
    • https://gipavenox.weebly.com/uploads/1/3/5/9/135966662/74a6e2.pdfIn PDF document text
    • https://vobulesije.weebly.com/uploads/1/3/1/8/131857334/4815155845ed.pdfIn PDF document text
    • http://bio-ita.fun/devatizefbg85l.pdfIn PDF document text
    • http://storeyou.store/will_the_white_princess_have_a_season_2jrjxn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_5fda3a4c9cf49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487906/normal_601ee44c66bb8.pdfIn PDF document text
    • http://rodina38.ru/elric_of_melnibone_book_2ovqwy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_228bcc1bc6534fb1b206236c192032d1.pdf?index=trueIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_6667b448cf0342a5bf481083197edc58.pdf?index=trueIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_df8a47da6cd6452fafc6ee07dd61cbb2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabegokek/bulawayo_polytechnic_application_form.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_2c44a59483d94bec9647595429cbad24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/superantispyware_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/android_app_development_course_fees.pdfIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_eae89e13190f442b998c428cec9b8e8d.pdf?index=trueIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_198afdf69c2046438c585193459fb065.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_5afb1072ec89451596848d73269366ec.pdf?index=trueIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_25a5a0c63d6f4c1c9393e2bf3bb01ceb.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_3aad5d7c85a240af9c51e6a2c2bc1fec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/42189517756.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_b5bdbf7155484d04a7ae3202d631f248.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/angola_house_music.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_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 5184 bytes
SHA-256: b1f4cc6da63f8d74a4ab72a718a96312a89276d5321d33856abbcc555922ddcc
font_01_sfnt_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 10520 bytes
SHA-256: 7d2ac1f045e530045fe95c0af831b3744457023147b00635f226053a61698f7c