Malicious PDF — malware analysis report

Static analysis result for SHA-256 376781d10e065940…

MALICIOUS

PDF

73.8 KB Created: 2021-03-11 13:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 245d82eccc8e30dddb77dbb80dba18e3 SHA-1: 4819ba39a65a2465d1a1f67f0a5cb4e0934092d8 SHA-256: 376781d10e06594024c4770e88580c3850e30ffb1ee9e78661a2d93d1209f5f2
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically targeting 'better business bureau phone number michigan' and leading to a suspicious domain. Heuristics indicate this PDF is a link farm designed for SEO manipulation and has been flagged by ML classifiers and ClamAV as malicious phishing content. The presence of multiple external URIs suggests an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=better+business+bureau+phone+number+michigan PDF link annotation
    • http://barashik.space/78306009250evhuk.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/korofipiluvo.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/dell_optiplex_9020_mt_i7-4770_specs.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/nijodutafog.pdfIn PDF document text
    • http://reduslim-shopofficial.site/bemumifanovosupodoto41wvj.pdfIn PDF document text
    • http://prizinsta24.site/1063686734669u2e.pdfIn PDF document text
    • http://segway-wheelchair.ru/how_does_a_stressless_recliner_worksbifn.pdfIn PDF document text
    • http://puxelasuwo.22web.org/who_makes_the_most_reliable_lawn_tractor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_ddd556b0e3da4877b5c4f0d1d9978c94.pdf?index=trueIn PDF document text
    • http://gegagino.epizy.com/52307792659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5276c9d-ee5d-46a3-926b-b3f696d7dcbb/what_does_apple_tree_mean.pdfIn PDF document text
    • http://pepebejawu.epizy.com/tesopek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0950a56b-ee5a-43f0-9f0e-e1d25c5ccd43/five_night_at_freddy_free_game.pdfIn PDF document text
    • http://medesawawolujim.epizy.com/51143828366.pdfIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_694016341584462499c36b6b7c2d612c.pdf?index=trueIn PDF document text
    • http://zuxekesimulir.epizy.com/92031712741.pdfIn PDF document text
    • http://ramimivojis.rf.gd/81253642762.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_2bf2e1bb4a3a4b138d3aa9af1e909e9a.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_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 5504 bytes
SHA-256: 2df743e4797834b24f51fa3e57520342bd1aa4fd1ecaf2017788587d19cc98d9
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 10948 bytes
SHA-256: df38e212d8dd0ac9a7a7ab965bb3f22cac53cb9334c936fa0e6e6fa0146a9f75

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