Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa84a622380eff7…

MALICIOUS

PDF

98.2 KB Created: 2021-03-18 05:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9622f5f7de562b86413ed5593edfbbbb SHA-1: 5e1764f64db0b36d62b6b536d91dab29c701a3d3 SHA-256: faa84a622380eff7ace4769104d9337ec28aa0c265af03537ceb27386e68b333
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://dugedepap.ru/award?keyword=definicion+de+biotecnologia+vegetal+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393889/normal_6047b9a55dc39.pdfIn PDF document text
    • https://pujelewi.weebly.com/uploads/1/3/4/0/134017294/61cdc0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_6026a4c48cb66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_6038753862ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_5fd8844b0b5ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377109/normal_5ff15e0674725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_605042c8ca543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501374/normal_60120af6bd3f9.pdfIn PDF document text
    • https://lasezafokovopar.weebly.com/uploads/1/3/5/2/135294620/nedijapopuseti-keduxaxofifal-jorokazobig-bijibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_6016fba48fc6b.pdfIn PDF document text
    • https://pemalerokefoge.weebly.com/uploads/1/3/1/6/131606165/serafes.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/mupukesunobaga/bovabuwuwarikitu.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/flex_head_mattress_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9c417c-40db-4943-a1fb-b7a64750c4c9/pride__prejudice_2005_film_watch_online.pdfIn PDF document text
    • http://mevediruzorapaz.rf.gd/69340562547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44f5739-8951-4019-9e43-7db60e2dbf5f/legend_of_zelda_ocarina_of_time_3ds_master_quest_big_poe_locations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8d08fd-c5a8-4966-b4f1-76a97155fda8/how_to_check_eligibility_for_medicaid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f108551f-5e17-4491-b272-e6cf8a477f97/what_was_the_reason_the_renaissance_started_in_italy.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/cetoacidosis_diabetica_2018_gpc.pdfIn PDF document text
    • http://rapaxaj.rf.gd/picture_frame_templates_to_print.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ad61113-ca6b-44ea-98e7-abd04cc078cd/bodeva.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/blur_song_2_drum_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/belukeluvolevara.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_off00013c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4D 5248 bytes
SHA-256: 6218cd6ff3fa63b089d51225da19820ee9ff1bfdde4254f86377443b8f44abc8
font_01_sfnt_off00014e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4E 13452 bytes
SHA-256: 0f82bd531a473852e87340327cedde5117e4dec30cb1c159290a3b1a5ff8e6e3