Malicious PDF — malware analysis report

Static analysis result for SHA-256 538a40af76f290ee…

MALICIOUS

PDF

79.8 KB Created: 2021-06-02 15:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 579dfafc8cd10388eb061963caea4065 SHA-1: e8b6a3b53f020831eec2670118427bf87f71b399 SHA-256: 538a40af76f290ee6e4abae4732b4f1bc243a58bbd949e6b5fea2e8dbf9e4708
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL being a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://ketchas.ru/pbw?utm_term=formato+carta+poder+word+descargar PDF link annotation
    • https://xinulirolome.weebly.com/uploads/1/3/4/5/134599248/jozuvufadimez.pdfIn PDF document text
    • https://pajowivi.weebly.com/uploads/1/3/4/9/134904739/gevarufunured-zexikoxem-jizizezilefesuv.pdfIn PDF document text
    • https://bugulokuli.weebly.com/uploads/1/3/4/6/134628946/8081316.pdfIn PDF document text
    • https://wivamugetatiwaw.weebly.com/uploads/1/3/1/1/131164202/8997661.pdfIn PDF document text
    • https://gegirugotosizuk.weebly.com/uploads/1/3/5/3/135397722/vagonawo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zopujoxobug.pbworks.com/f/bandiere_del_mondo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/850e1cfd-4892-4005-bfb6-709a37068179/88899742255.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/99590820379.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/babubafekelofazefaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce64a9ce-d219-4e38-8c28-9d9559841465/assassination_of_franz_ferdinand_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ada7423-07b8-4998-acb2-e1d8b7ccb039/kitchenaid_double_oven_range_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/670c2e91-a9ac-4136-8b56-40c3f627e605/autocad_lt_2016_free_download.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/w/file/fetch/144491604/16698051018.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/a1_smart_watch_manual.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/f/man_on_fire_hollywood_hindi_dubbed_movie_download_telegram_channel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff1c280-4130-4cea-90f5-86e62264ee61/49664207351.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/w/file/fetch/144480258/airplay_2_auf_sony_android_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40fc9ccf-c8fd-4aab-9a01-0500544daca4/76532965525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da19090d-0220-48e2-9cd1-9a7b7000c4b3/53667678351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f9224a-8e40-4e03-82c1-e6c6e6ad62be/what_can_cause_high_blood_pressure_and_dizziness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2aefb67-b642-43e6-898f-db168ad9e40e/how_to_descale_the_keurig_supreme_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a830604-21b5-4594-80e2-290be395580d/82041562720.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_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 5408 bytes
SHA-256: e5f9ecdc7f67d6241024496d8edb8935d543580005d0e3feb3981d6fbe9ac85d
font_01_sfnt_off00010aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAE 11536 bytes
SHA-256: b9ab05031305637bafc25c890aaaefd60f2f7031f2ae0bbae6184ddf2847c271