Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1bd89072ef73b8…

MALICIOUS

PDF

97.3 KB Created: 2021-03-22 20:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 198b56dbe7b2b7dc1805a20bb6337b59 SHA-1: 2664d6e82d63e5b801aaa995ea3194a6e5ad0566 SHA-256: 5b1bd89072ef73b862475f0256cc1cd8a7e22dcb3341c6e0c85972595df63f21
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or spam campaign. The PDF structure and embedded content indicate it's intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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 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://dugedepap.ru/award?keyword=anthropometry+ergonomics+and+the+design+of+work+pdf PDF link annotation
    • http://hushseo.online/rasowuxojogymb1s.pdfIn PDF document text
    • http://legionmone.xyz/radiwumakabutb5s.pdfIn PDF document text
    • http://paktum.pro/magibaradafudukuxobuvi8hy6m.pdfIn PDF document text
    • http://postel-na-zakaz.ru/gozeguloleziteliduxupuub4.pdfIn PDF document text
    • http://secureappeal.com/899002050338kgiw.pdfIn PDF document text
    • https://kamukijupekud.weebly.com/uploads/1/3/3/9/133997827/858e66a.pdfIn PDF document text
    • https://gawinageriju.weebly.com/uploads/1/3/0/8/130874076/suxur.pdfIn PDF document text
    • https://kopusitubo.weebly.com/uploads/1/3/4/6/134698796/78ee1d.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/kezosu.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/xitumixixa.pdfIn PDF document text
    • http://romeoplanet.club/weider_crossbow_advantage_exercise_chartdgc42.pdfIn PDF document text
    • http://latujajugudewum.iblogger.org/gym_beginner_workout_plan.pdfIn PDF document text
    • http://pokypka.xyz/auriculoterapia_puntos_maestros4hq2t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zajozikudesurek.epizy.com/how_to_program_a_liftmaster_garage_door_opener_remote.pdfIn PDF document text
    • http://nozixexegaliwe.rf.gd/grammarway_4_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/tetemefumogulawirut.pdfIn PDF document text
    • https://bd5e8a39-7345-4d1c-b933-e8ec171ec4b0.filesusr.com/ugd/2dab9e_5863bf9435484cf99a8881f2454057c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/dijuwirupovebimorofo.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_f8672525034f441a9106d42ed2663962.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/chuck_taylor_all_star_ox_platform_sneaker.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_86f45191f077425e86068f7d744233ec.pdf?index=trueIn PDF document text
    • http://ninivekav.rf.gd/18206242390.pdfIn PDF document text
    • http://vobulag.rf.gd/17815506479.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_690b5f3671884feda3a97c09e25d692c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nakevoja/keleregiwijebulev.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_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 5784 bytes
SHA-256: a9112160fc5e8ba75842b9bc7bc060e03b28f378a6251caf63581829258b6242
font_01_sfnt_off000137c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C8 12876 bytes
SHA-256: 078e12e4a46548652f4b9a8a38ed046be3f1aa0a6b74968c5660ecb55173be81
font_02_sfnt_off00016327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16327 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940