Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fd6853b5276c6e…

MALICIOUS

PDF

80.3 KB Created: 2021-04-20 23:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3f53e8d7f005525e58b31b2c83e7ab16 SHA-1: 69641b7163657344e24b45c7cacba7dc5f7d561a SHA-256: 71fd6853b5276c6e48dbfa446f6e1b22aee9dfd185c7066140a9a7974949d4b3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary purpose appears to be directing users to potentially malicious or deceptive external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=after+book+anna+todd+wattpad PDF link annotation
    • http://lejunuzegakikuv.mypressonline.com/how_to_control_soundbar_with_comcast_remote.pdfIn PDF document text
    • http://fanuvazav.scienceontheweb.net/anatomie_du_cerveau_humain.pdfIn PDF document text
    • http://bofitakun.iblogger.org/what_sd_cards_are_compatible_with_galaxy_tab_a7.pdfIn PDF document text
    • http://vozilazotov.22web.org/dokumen_amdal_kehutanan.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/muvevanepen/how_to_turn_on_windtunnel_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31cb9d25-1c39-44d6-ac51-d0e192231c92/gubow.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_b836706bb8ed4c7397faaf1acec747ab.pdf?index=trueIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/ball_mill_specification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27815ef-5f0c-4986-89da-04353c7e6e66/statistics_and_probability_deped_tambayan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6012ba54-c649-4d72-bd7f-89d2d528957b/94078791315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b9cb7f-3e53-4e20-99fe-3fc401be026e/how_to_put_factored_form_into_standard_form.pdfIn PDF document text
    • https://60b161a2-b511-46bc-b48c-7ca4331f2db3.filesusr.com/ugd/34b71b_71c6cc0d1e6746758d107ef0843e1482.pdf?index=trueIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_7b2e4347bae747a7b0845c76c3face06.pdf?index=trueIn PDF document text
    • http://tabasisexiga.rf.gd/global_agricultural_machinery_market.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/oscar_et_la_dame_rose_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a738b560-3b04-4098-8086-ae4487504b7b/thick_face_black_heart_audio.pdfIn PDF document text
    • http://mivizuganax.rf.gd/aristotle_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/849684fe-7229-4cbc-80aa-a1bb6953cb1f/digofidosumoteganewotot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18858aa5-0b62-4475-bb78-8c5f4644bfe7/gawaxomiwak.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/affective_domain.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_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 5112 bytes
SHA-256: b1111d1bd785e8d8fa13e33dab57d657098ceb2e73c3776d54e2b0537e786d02
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 11368 bytes
SHA-256: 1c4360ac69b35f4f1821d713d542a6b2585da74498b654c6e37eb670317b7ce0