Malicious PDF — malware analysis report

Static analysis result for SHA-256 5486bc7e681bacd1…

MALICIOUS

PDF

91.9 KB Created: 2021-04-07 01:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 91e3a1c9abe85d24723960e7967c4d03 SHA-1: 3a5ef126dad998d41574a0bdec7682369b75e36c SHA-256: 5486bc7e681bacd13848f2ca4baf1f29440928fb4a73ac8bf8eae0598f5ac81b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=the+audacity+of+hope+chapter+3+summary PDF link annotation
    • http://wadupobem.iblogger.org/msi_nvidia_geforce_gtx_970_armor_4gd5t_oc.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/abfc55673218c92.pdfIn PDF document text
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/7505879.pdfIn PDF document text
    • http://svoylend.xyz/j24_spinnaker_sheet_lengtheuco3.pdfIn PDF document text
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/c49d1b54476.pdfIn PDF document text
    • http://naturalik.fun/plan_anual_trabajo_comision_tecnico_pedagogicowqunj.pdfIn PDF document text
    • http://xekaleduwam.iblogger.org/achieve_ielts_test_3_reading_answers.pdfIn PDF document text
    • http://esagafow.fun/99790778267ksyo3.pdfIn PDF document text
    • http://meetly.space/gimalogezuvimei6y8q.pdfIn PDF document text
    • http://ecoterritory.store/605439067326ibif.pdfIn PDF document text
    • https://xemuputib.weebly.com/uploads/1/3/4/5/134506680/6e206.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/redegelesibif/bricks_breaker_2_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a43108b9-427c-4570-95a9-249b2bceff38/prayer_of_jabez_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5b224f-1010-4c29-8291-85132a45defa/understanding_motivation_and_emotion_6th_ed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf56633-0975-4d7c-8339-fc4d9de9dd4e/21_laws_of_leadership_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/510b33b9-b815-4788-a294-7979adb2f7fa/what_are_the_causes_of_chieftaincy_disputes_in_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/330c2493-f375-4271-800e-124f441ed221/us_army_toc_operations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078219c3-0af3-4de1-a320-72c2a45d2c82/maze_runner_4_full_movie_download_in_hindi_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/badb6a94-941c-4d32-95ff-eb1534596e67/filexufefabizabo.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/delonghi_oil_filled_radiators_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/xufazenisapusawixon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b53f5a-9f26-4146-98ad-5aee3f30de5b/navy_subspecialty_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e975741-ef9f-43bf-bb33-d4897b695efb/in_what_nitrogen_bases_are_dna_and_rna_similar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96fc7dd-7567-44ae-8777-931a67c2bb8b/82511631082.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_off000129c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C3 5576 bytes
SHA-256: a2041ed7ad746b0a89d53652de96226694a1640ae5dd26cf5fc6dbfe78f074fa
font_01_sfnt_off00013c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9E 10940 bytes
SHA-256: 4026a881810e76fbdd31fc29b74c637ba138fe6cee4b22110cfe1aae4a23a766