Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffbac3384681ecd…

MALICIOUS

PDF

86.3 KB Created: 2021-05-31 05:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7454b52a1b2f2ba20ea30bef4fc05746 SHA-1: ce1c109338bde5ab46a1653fc8902f688a44f62a SHA-256: 1ffbac3384681ecd5ef52c709d271984b46e028372ad877795de39ca0e993171
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 0.9986

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://crophysi.ru/123?utm_term=bitzer+bse-+170+datasheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418574/normal_5ff7b7233062b.pdfIn PDF document text
    • https://fosovumukudire.weebly.com/uploads/1/3/4/2/134235423/newasi-bavasugidepulok.pdfIn PDF document text
    • https://monubigikupo.weebly.com/uploads/1/3/4/4/134493781/e595d13953d74e.pdfIn PDF document text
    • https://tebeneka.weebly.com/uploads/1/3/0/8/130874559/botosasalik.pdfIn PDF document text
    • https://luzepomi.weebly.com/uploads/1/3/1/8/131856518/wukaguz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_6053a9154ac2e.pdfIn PDF document text
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/rovivetemugesi.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/e6b925b372.pdfIn PDF document text
    • https://wipowolulufobud.weebly.com/uploads/1/3/1/4/131437369/bazonebosepaz_jeloxedakowari_sumukitenadeduj.pdfIn PDF document text
    • https://zorazuzibenad.weebly.com/uploads/1/3/4/6/134617736/garizigefize-sajebon-xevolevoganumu-midukazazoti.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
    • https://uploads.strikinglycdn.com/files/9199196b-dfc9-4eca-a33a-5af19dbafd7c/insrer_un_sur_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a39369c-43b1-4d07-8932-2bee9df1e3e5/xeriwepipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b22071-31ce-46c6-80d7-03e1b106dae8/35026144702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e93122-83d9-478b-9f2a-d72bb414d02c/xemetedewij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f8fefc-a754-4f08-b043-fc1a9bf7c319/zopesor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6f322a-e3ce-44d5-916b-c4c02e264984/how_to_reduce_levels_in_table_of_contents_word_2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bf9cc07-db2e-4732-aa73-6fd894ea8fc1/jesozamaniwuvusakige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0295900a-2155-455e-a104-222470f3c215/bose_wave_radio_cd_player_skipping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2f5cee-4361-401a-b380-6cad6155dbb5/zazug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06f7d51-857e-44cd-b2d9-947d2b2f70df/57574098589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f5c57d-8a47-4f7b-b18f-f9808096e74a/how_to_remove_deep_freeze_without_password_windows_10.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 2968 bytes
SHA-256: 463297b21fd3ab12ec992728a4523e4b1adc09ff4abf5990468ec284d0fe38bc
font_01_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 4996 bytes
SHA-256: fc387a9c269681a917b1a80cb44b4e2b2ee89378db26905f863e0441b3f6152c
font_02_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 17588 bytes
SHA-256: c6011683522b2a99c863eab8a12afaf0123ea52a8a6cea30b7d7e5ef641c553e
font_03_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 16392 bytes
SHA-256: 90f143efa8068db72e6a6af4c3cc398ec1ea2f0d18f9d14d667213691a98cecd
font_04_sfnt_off00013c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C40 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34