Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8939e32792c9f8b…

MALICIOUS

PDF

79.0 KB Created: 2021-03-10 17:56:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: aa34bf0cbb055cbca604ee7e8852a8cf SHA-1: 47b033bdc2b9d9d81e197f37082739bae90a585d SHA-256: f8939e32792c9f8b9af4e9933f1dac2b9baebf969b061799e9b4b5f12c5e21f5
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of luring users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/123?utm_term=samsung+s9+bootloader PDF link annotation
    • https://mamapesuwilataj.weebly.com/uploads/1/3/4/8/134857931/1080460.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/vermintide_2_grimoire_disappear.pdfIn PDF document text
    • http://pifowovumuwe.medianewsonline.com/the_fast_forward_mba_in_project_management_4th_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464862/normal_5ffccb443cc01.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/yoga_poses_for_weight_loss_step_by_step.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/words_their_way_word_sorts_for_within_word_pattern_spellers.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/pemir.pdfIn PDF document text
    • http://zusevad.22web.org/kumipuvunejamonir.pdfIn PDF document text
    • https://zukikopan.weebly.com/uploads/1/3/0/7/130775822/133e7b2ecac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_6009c5c7409aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446285/normal_5fce17c3827cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_6041d293e96ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464720/normal_60286670d4997.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/45634260892.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://woxomog.rf.gd/71249902006.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/is_wow_available_for_mac.pdfIn PDF document text
    • http://savuxerekeze.epizy.com/93580125437.pdfIn PDF document text
    • http://bexovaxi.epizy.com/bootstrap_web_templates_free.pdfIn PDF document text
    • http://sidijujaz.epizy.com/fimudi.pdfIn PDF document text
    • http://sujawusoxenum.rf.gd/52694316215.pdfIn PDF document text
    • http://duwopatovulid.rf.gd/islamic_baby_boy_names_with_meaning.pdfIn PDF document text
    • http://pasasowagore.rf.gd/how_did_alliances_help_cause_world_war_i.pdfIn PDF document text
    • http://tosotagerazopor.epizy.com/legora.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 5376 bytes
SHA-256: 7d67638473d1c5264479f30d0593db363d45fd43f43692bb4963ac18a8f2ca66
font_01_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 10900 bytes
SHA-256: 483292dc15f561047938ffc0263adbe05bcb7e329075bd6879a57ea4f8c62dd6
font_02_sfnt_off00012045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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