Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df72733e43ba9ef…

MALICIOUS

PDF

78.2 KB Created: 2021-04-03 20:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a792e1a016792f8f75c4ca536b0a8aa8 SHA-1: 90b8dc6f6e9d41e9effd04e3e32b6fefdef12ec9 SHA-256: 2df72733e43ba9efa0eb832fe07a1f22c907667a18084226d1aa8ba41c67d089
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary malicious activity appears to be the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/123?utm_term=ascites+guidelines+2017 PDF link annotation
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/xubogipedotiban.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/jfidogc/dream_club_zero_ps_vita.pdfIn PDF document text
    • http://healthit.space/57312512975shuat.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/hjhcLxN/zisugupama.pdfIn PDF document text
    • http://securityverifiedservices.com/56650874707xl206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_60484a4fd1bd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_60159dfec242b.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/3132017.pdfIn PDF document text
    • http://gatorama.fun/top_alternative_songs_2010_billboard1enb7.pdfIn PDF document text
    • https://pepulumowuso.weebly.com/uploads/1/3/2/6/132681954/5ad6b5e70ebfb2f.pdfIn PDF document text
    • http://tk-pobeda.site/filing_false_police_report_illinoisusnvh.pdfIn PDF document text
    • https://rutarutan.weebly.com/uploads/1/3/5/2/135294158/malarav_xeduru_wivejowoladubax.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/Zgehaje/hexagon_classic_hexxagon_board_games.pdfIn PDF document text
    • http://damvglaz1.xyz/bakarasiwelataposowi8pwao.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/meribaxizulekufupawazucphms.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/imjbgeH/bafitamiveparitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369784/normal_5ff9c97042496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_601e808885caa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_18fdb0c05ef84624985a2b0e6ab0ab1b.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_b5e15f38052e4d90bd78461881926bdb.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_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 5196 bytes
SHA-256: 5e610f1aa4b120d0a2f9fb9aa18342a856c8ad29e2d1cb29e1ac29484661c247
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 10804 bytes
SHA-256: 8b7fcb275bf0c025b856178ce9352f489d1579ec27a3d0cbfe1deecf7bb8e9b5

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