Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7498d956a385d0…

MALICIOUS

PDF

86.0 KB Created: 2021-03-04 15:09:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e1631dfe4e5d7cd8bb05e8dcf3d88bfe SHA-1: b12aac40e52c535d381f3fb456d4902a28acce4c SHA-256: cc7498d956a385d041b25bbf861cb2d25191ddbb8b05c053a48e993f6de822ba
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external URLs and the overall detection profile point towards a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/123?utm_term=sony+av+receiver+str-dn1040 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480899/normal_5fc912684b147.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446635/normal_5fcd785f913d1.pdfIn PDF document text
    • https://lugigotaxur.weebly.com/uploads/1/3/0/9/130969655/2283396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390373/normal_5fe04d6769e6c.pdfIn PDF document text
    • https://rewesiriwo.weebly.com/uploads/1/3/4/3/134318955/d61d6942a7ef8c.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/0a193d19d438ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_6028f91491c14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413238/normal_5feb98fd18e53.pdfIn PDF document text
    • http://kadabafomelu.66ghz.com/8747520495.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1a4961-dcea-4811-a76b-2ef97c2d8195/53703745370.pdfIn PDF document text
    • http://zarilapaserit.rf.gd/70837624977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59aaaea2-ea7c-4032-9f0c-a503be3685a6/how_to_adjust_depth_on_central_pneumatic_nail_gun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131abedf-dd03-48de-b62c-97a665b31f9e/fojapuzazisemevoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178f3a50-02b4-4346-8382-bf730446a4dc/tizujifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2140abb-572a-48f2-8980-54d875e8268a/51639726624.pdfIn PDF document text
    • http://sazevaxorofezag.epizy.com/63100068748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69cd60a8-bbad-4982-9e34-d52d3ebb6766/what_is_screening_method.pdfIn PDF document text
    • http://jikelofov.rf.gd/mesubimapeminebegisasox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f42d0d0-a389-48d1-90e8-2ca35c575840/how_to_formulate_interview_questions_for_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cafa05e7-9e3c-423d-9f60-f5de301b14c5/how_to_write_a_tv_script_format.pdfIn PDF document text
    • http://giramipaso.epizy.com/drawing_down_the_moon_beherit.pdfIn PDF document text
    • http://merijezogaxik.epizy.com/mcgraw_hill_worksheet_answers_science.pdfIn PDF document text
    • http://bitesokilok.epizy.com/meforoxonozopipafa.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_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 5480 bytes
SHA-256: e49b8411b75947c065d4b5b83901ddf571f67566ae9269cce87c4abaf35585ab
font_01_sfnt_off0001247a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247A 11408 bytes
SHA-256: 9d84cad1ec9c9f9d28015a3bf619bb6da14501b00119fd83b5d5dece32ea12c5