Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d9b3d0ce8717b4…

MALICIOUS

PDF

97.0 KB Created: 2021-03-19 10:35:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6768521e3e4880cef69c767e20536f6 SHA-1: 770c4d59fcd24f8d921ccc3f5ffe346495d00cb9 SHA-256: 28d9b3d0ce8717b4bcceed56fdb62af68845edc5efa6231d23dee413cebc3287
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting and contains instructions to disable security software. The presence of embedded URLs, including one pointing to a suspicious domain, suggests an attempt to lure the user to malicious content or download further stages. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://jacksth.ru/123?utm_term=azure+striker+gunvolt+2+3ds
    • http://midunetojonawiw.mywebcommunity.org/un_curso_de_milagros_leccin_1.pdf
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5fc9dbcb737cb.pdf
    • http://sabovibin.medianewsonline.com/gafufenodevafum.pdf
    • https://cdn-cms.f-static.net/uploads/4490519/normal_601d5c7e9093a.pdf
    • http://xonejalevesezom.sportsontheweb.net/51851249366.pdf
    • https://cdn-cms.f-static.net/uploads/4424696/normal_5fdbe2136e619.pdf
    • http://lnstagramcopyrigtservice.com/hoover_windtunnel_belt_diagram9h6wn.pdf
    • http://postel-na-zakaz.ru/kowurixebi2c8pp.pdf
    • http://samyog.ru/how_many_hundreds_are_in_50000uzuwx.pdf
    • http://tidirakozodawon.getenjoyment.net/giburim.pdf
    • http://iminn.ru/fadapapinofenitumujezwdes4.pdf
    • http://lezigovedavide.getenjoyment.net/91787274389.pdf
    • http://about-central.com/para_que_sirve_la_vitamina_dr2yzq.pdf
    • http://wordsideget.top/husqvarna_hu725awdex_parts750p1.pdf
    • https://static.s123-cdn-static.com/uploads/4368223/normal_5fc73ee38cea5.pdf
    • http://sekelenogake.getenjoyment.net/arithmetic_sequences_and_series_worksheet_answers.pdf
    • http://prostotit.site/rudesokesukajofa6pvw0.pdf
    • http://lawigimik.iblogger.org/apc_backup_550_software.pdf
    • http://kevebofuru.medianewsonline.com/13634950367.pdf
    • http://futuroke.iblogger.org/kamope.pdf
    • http://pedrons.space/gerry_mulligan_discographyut98l.pdf
    • http://azorocheat6.xyz/97349095419qvgyk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fiforeru.atwebpages.com/52821992379.pdf
    • http://disukifas.epizy.com/what_is_a_good_rub_for_smoked_brisket.pdf
    • http://tabonozekes.epizy.com/lazenukijukubuzopub.pdf
    • http://fukefuxatolu.epizy.com/99685875819.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c2.bin
db522eb2725f3ad3320bf382b31752abd3a4e5657522c3a7dbb29583e838b689		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 27592 bytes
font_01_sfnt_off00013b57.bin
0a465236b14586da425aeb764dc22bbd67873c19555b45f0bf80ca3a4c593a1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B57 5244 bytes
font_02_sfnt_off00014d54.bin
d2f2e96cc3dd8aad43e92280754aa03697c19dae0b1cfd250bf9ace7c0f48bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D54 11736 bytes

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