Malicious PDF — malware analysis report

Static analysis result for SHA-256 955dba69c4584634…

MALICIOUS

PDF

96.6 KB Created: 2021-06-06 12:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d9276d49c0ee9f467c14d01d3f66ef15 SHA-1: 44db07413077f9fb444062532f7314ac63348c9a SHA-256: 955dba69c4584634b6a41144639fb5579a2be70189029777b08fe041411cf8aa
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially malicious content.

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://garglob.ru/pbw?utm_term=what+is+adsorption+isotherm+describe+the+freundlich+adsorption+isotherm PDF link annotation
    • https://dugesadodi.weebly.com/uploads/1/3/1/1/131164249/9637634.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/suwexumovasebawujobu.pdfIn PDF document text
    • https://noxojinuk.weebly.com/uploads/1/3/4/4/134479051/30d6b7.pdfIn PDF document text
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/tasomebudapugij-retudorizevup-lewuworamivo.pdfIn PDF document text
    • https://puduragasesalot.weebly.com/uploads/1/3/4/5/134581755/potopokenunij.pdfIn PDF document text
    • https://rumefonurotu.weebly.com/uploads/1/3/0/7/130740232/ea90c65c923fd7.pdfIn PDF document text
    • https://kikeletiwemuk.weebly.com/uploads/1/3/4/6/134671512/bulilikaf.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/8110745d-2aec-433c-9f74-68f0eead93a8/jitugijiwavoxodalak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8324475-3f28-4bcf-a9dc-1ce8ccb852b3/20097650984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2486a4f1-8ced-4a94-993a-5916de58439b/16541042590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4828a5-0753-4399-8b25-ac2a10f3e33b/matlab_symbolic_toolbox_partial_differential_equation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3198313d-23ad-464e-81da-f8bca89afed4/fuvapapibikometovaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cde0787-ad52-4690-8f7e-a7f0f616eb36/multiplying_functions_worksheet_kuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03db4920-e3f4-4f7f-a526-492a773d93bb/18454083346.pdfIn PDF document text
    • http://zobafolu.pbworks.com/w/file/fetch/144712740/1_to_1000_numbers_in_english_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ac7ff2-be97-480f-8fd4-cd113317706d/xugut.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/how_to_adjust_accelerator_pedal_position_sensor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b7c2e6-fbb7-486b-a99c-caabd6b6843f/67645207859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f96686b-4d5a-4c35-900a-dd62b8978bfc/vujipajigojodep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 5548 bytes
SHA-256: 3449309fd776538bc2e53a2bf259b35ff4744ae429e582e3c8d2bd9a14d874e5
font_01_sfnt_off0001326d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326D 13384 bytes
SHA-256: db417c55f1c226beea32faeae46ccb762e567613e159c6bcf5a261d077c2e08a
font_02_sfnt_off00015f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5D 16140 bytes
SHA-256: 40824931dfc568085c5af9baf6a35f292035f05abf254fbede95d2340ff98ba4