Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ced85d528426b9…

MALICIOUS

PDF

81.4 KB Created: 2021-03-15 05:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cdfbbb0fb02f509c2f9630b210a87367 SHA-1: b3c99d8347b5fab9d8ddae70d0bae70aeabb0846 SHA-256: 67ced85d528426b92e105311a110448f729fe96f2a1055730121bae65e6e85c2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily corrupted, suggests a lure related to 'Decision tree python without sklearn', likely to attract victims to the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/strik?utm_term=decision+tree+python+without+sklearn PDF link annotation
    • https://cdn.sqhk.co/ximegawaso/anwihNc/the_wiki_game_unblocked.pdfIn PDF document text
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/xumetirewu.pdfIn PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/fatowogasekapifuw.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/99eda07324a.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/nefiwolakikeg_madadumi.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/dibominenisos_nuzegumetexa_kusidanilixo_xixasuruz.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/ghPmnji/fobekekovilobotose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483336/normal_603593f4754b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_5fd671df77663.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/lghiahf/hockey_app_is_offered_by.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_6037f1d8daf15.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/iiih7hi/71743618828.pdfIn PDF document text
    • https://cdn.sqhk.co/woledowo/nhdjjgf/luxijerener.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412891/normal_5ff117cad82f7.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/7f23448e-cb77-4e7b-ad8e-5856530ce304/betuxafenusibeka.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/game_soul_blade_android_free.pdfIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_169574345c8d4d58b27be8392088518b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85ce921-6b34-42a0-a920-898dea9aa6da/galaxy_s4_mini_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b04e4cb-f063-4741-aada-4b30928a36b0/acting_and_performance_for_animation.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_91fd314c576b430e989d39e7bc4ba3ab.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_470cdb103fd84bf383e8538aba2a34d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/13394719516.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/14469693212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8310ff82-26cd-4643-a94a-556ff09a2eb3/bumugovugo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 5280 bytes
SHA-256: 2560d66143d6c3d1a12303ae2748d006b4b0c2893549cd9848055b5ed37e049d
font_01_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 10272 bytes
SHA-256: 1b0fa570767227bb0bb25a3629422116dbb8b13f816c4aa1470f596714ff9781
font_02_sfnt_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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