Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6c81389939add5…

MALICIOUS

PDF

85.2 KB Created: 2021-04-20 16:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2a93f9f4483d6e9f2227e86818643176 SHA-1: 211f73095e3433bb5f551e85ad92991545154c6f SHA-256: 3b6c81389939add5d98ccc2f1b4bdd86cdf395fac4ac7982cf22d29ffb0a94a2
166 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The document body, though partially corrupted, contains a deceptive query about a movie, likely intended to entice users to click on embedded links. The presence of numerous external URIs, many hosted on disposable domains, and the 'SE_MFA_LURE' heuristic strongly suggest credential harvesting or abuse of multi-factor authentication mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://jumiwimov.ru/strik?utm_term=is+there+going+to+be+a+4th+maze+runner+movie PDF link annotation
    • http://lotibamuzuti.scienceontheweb.net/36583379130.pdfIn PDF document text
    • http://cabinetsly.xyz/anime_slayer_app_freen4qd4.pdfIn PDF document text
    • https://sigajijatikad.weebly.com/uploads/1/3/1/3/131379485/6422052.pdfIn PDF document text
    • http://tagoturuluro.medianewsonline.com/10th_maths_guide_2020_tamil_medium_free_download.pdfIn PDF document text
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/xodab-jebusoreli-jugiwilatovavod-rurikukanax.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/95590394698.pdfIn PDF document text
    • http://lynciguest.com/77681194692egn8h.pdfIn PDF document text
    • http://pesuloduf.medianewsonline.com/how_to_install_pirated_games_on_pc.pdfIn PDF document text
    • http://bufaturofonoko.22web.org/broadcast_verb_past_form.pdfIn PDF document text
    • http://edevletorg.com/73955409110hfhop.pdfIn PDF document text
    • http://videohost.space/adafruit_fingerprint_library_for_arduinoy7e53.pdfIn PDF document text
    • https://zerimesatevig.weebly.com/uploads/1/3/4/8/134879836/0d3349c.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/border_gateway_protocol_tutorial.pdfIn PDF document text
    • http://shoes-storie.club/celebrate_recovery_step_study_formatpd4kr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuzuvulas.epizy.com/putexanapolok.pdfIn PDF document text
    • http://vifidumefitur.atwebpages.com/53119229902.pdfIn PDF document text
    • http://kebenubes.onlinewebshop.net/sagakawokodirubof.pdfIn PDF document text
    • http://bipegokatif.onlinewebshop.net/49033210044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1970f85-0b76-466d-ad17-190c613f28c2/zogufosuraruf.pdfIn PDF document text
    • http://litosivofojolid.rf.gd/atomic_structure_of_first_20_elements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2209a1e-208e-403c-b89f-6df72ccfdf46/how_many_calories_in_half_a_medium_sweet_potato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e8be49-8253-4bdf-91f8-1b924604ad52/pomukajosowil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7fddae7-e1d7-42d9-b753-d062229f1b2d/13722978886.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_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 5344 bytes
SHA-256: 3611307e4bfc5fe4b09f4bef3c1136254f959f4e089defc3e073c93b2b7258af
font_01_sfnt_off00011fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEA 11464 bytes
SHA-256: 2adecabd429b0873ec8c222767c95640080fde7cff451aa44dbee551b1002748