Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e31d9c3ba55988…

MALICIOUS

PDF

85.9 KB Created: 2021-03-09 11:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a30cefef4c69ca0234c83f313b2d7c05 SHA-1: e03851890c34ec7682e4dbab6b8ca5be32399c78 SHA-256: 54e31d9c3ba5598842774262b9b447c14a82fd75125361a42688c44d710ae241
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users. The embedded URL 'https://pelibifir.ru/strik?utm_term=how+to+build+a+wood+splitter+plans' is the primary indicator of malicious intent, likely leading to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=how+to+build+a+wood+splitter+plans PDF link annotation
    • http://devovonabukuzim.66ghz.com/osha_scissor_lift_training_powerpoint.pdfIn PDF document text
    • http://fowunajokofow.iblogger.org/data_science_certificate_course.pdfIn PDF document text
    • http://pubomoxagu.22web.org/devas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavobawum/pepoxiweluxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f300df9-7c91-446a-907b-a6f93b51f204/83111990806.pdfIn PDF document text
    • http://zebixefaxiloj.rf.gd/20174729395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03006c60-766a-46a5-93cf-1f43479f21b9/22479487557.pdfIn PDF document text
    • http://kojuvurapamox.myartsonline.com/que_ignominia_en_la_biblia.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/how_to_reset_epson_ink_pad_counter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e409078d-439b-4550-94ff-45b731e25a35/ryobi_31cc_trimmer_spark_plug.pdfIn PDF document text
    • http://ratobewiwigu.atwebpages.com/adobe_photoshop_cs5_crack_free_download_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/weather_report_johannesburg_next_7_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69bfb867-43d7-47d4-9a27-1bc95d467496/yamaha_rx-v377_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/mackie_mix8_compact_mixer_review.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/kreg_jig_drill_depth_guide.pdfIn PDF document text
    • http://xotepugiz.rf.gd/dewalt_xr_circular_saw_manual.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/i_have_a_dream_commonlit_answer_key.pdfIn PDF document text
    • http://buzanuziti.myartsonline.com/naxupemizaxofoxedexikup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1de9d82e-30bc-474f-9f41-8e7b7a4ae4d7/64512492264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42274bed-cecd-45b5-8363-161bc4f45303/zijipomekujosivobuvuz.pdfIn PDF document text
    • http://xonesopidazuju.epizy.com/possessive_nouns_worksheet_for_grade_5.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 5148 bytes
SHA-256: b2f8e77de6d69e68bedb3279aa23e52602849002f889025f8a93e6ac13445fc8
font_01_sfnt_off00012666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12666 10384 bytes
SHA-256: 53341f40f601a64b76b89439e39732848b161071a10589bba7f21cc567c48b71