Malicious PDF — malware analysis report

Static analysis result for SHA-256 4746d91cd5a60119…

MALICIOUS

PDF

79.3 KB Created: 2021-03-20 12:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 66e85f874d74c998888cdeac2c398794 SHA-1: a8e5ef777598036b859cb09e8e77626bac4f8b56 SHA-256: 4746d91cd5a60119000add7b0b179814a77254e985b6b5dd3386934d7e17cb12
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=community+conflict+resolution+strategies+pdf PDF link annotation
    • https://cdn.sqhk.co/mezutowede/eFhimjc/9460823853.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/eRgdgjG/samsung_gallery_cloud_icon.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/should_google_chrome_have_full_access_to_my_account.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://s3.amazonaws.com/sowewazulejewi/amarillo_by_morning_sheet_music_violin_free.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_56c9a928650248a4820cd0ed1c351c25.pdf?index=trueIn PDF document text
    • http://sefowolo.atwebpages.com/what_does_structure_mean_in_writing.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_1758593f48b04dc089250068e32b6ca9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/juzolitazavelula.pdfIn PDF document text
    • http://rovuwuruw.epizy.com/33566884948.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_f410883d39c444b795ccfa59fc8eea0a.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_9e65382a2aab42659553106fb9d97c52.pdf?index=trueIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/cbr_test_procedure_download.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/letter_s_colouring_sheet.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_38dbf2c225b048cca0d0ec367557ce6a.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_04cd6c69505e4ca1b2e27fdc3e0ef3ce.pdf?index=trueIn PDF document text
    • http://radikabo.rf.gd/samuel_beckett_waiting_for_godot_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/baul_gaan_hit_song.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_d2ff7d3ba88b420c94fbf87050c7ee27.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_2f19a5f8408e422fbe71cba0c8085ffd.pdf?index=trueIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_5e1b7d9a950e454491fd6ad985879be9.pdf?index=trueIn 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_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 5484 bytes
SHA-256: 185ada183958ce1f00fb241d0ad43a0df76d8e9c90d2061a1bd6f6216714a480
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 10396 bytes
SHA-256: 4677f4d827e46de4fa36f76f41986be3e33bb649980d8dca7d535718d8d5a337
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34