Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb296559149909f…

MALICIOUS

PDF

87.7 KB Created: 2021-05-25 04:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 922312e17997a54c1715012b06b55090 SHA-1: 51b8d09956284c2c3359f16ee9a549f06cce7c60 SHA-256: 1fb296559149909f2a16c9a54ba016800891d45d1464383e734cf44f9bad95f7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=midsummer+night%2527s+dream+hermia+character+analysis PDF link annotation
    • https://vameduxa.weebly.com/uploads/1/3/4/6/134664578/dutomib_gadopokawib.pdfIn PDF document text
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/7354680.pdfIn PDF document text
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/nixetapufosok.pdfIn PDF document text
    • https://divevuke.weebly.com/uploads/1/3/3/9/133999966/zipeda.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/kazewexukuron-bozozesiman-sonoxepibati.pdfIn PDF document text
    • https://mejibafizafev.weebly.com/uploads/1/3/4/0/134042836/nomureva-juwobiz.pdfIn PDF document text
    • https://fefejixoloxit.weebly.com/uploads/1/3/0/9/130969032/5544476.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/pijivawipelesefik.pdfIn PDF document text
    • https://butijewib.weebly.com/uploads/1/3/4/8/134886415/nipikibokuz_ripuzu_pokos.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/4332128.pdfIn PDF document text
    • https://bepizapumi.weebly.com/uploads/1/3/5/3/135349865/tuwemixoko-titetuwujimopor-begasewa-dowolutimufe.pdfIn PDF document text
    • https://rutaluxunenore.weebly.com/uploads/1/3/0/7/130740368/senuxalosof_sirawenubiteja_tamupa_suvilelutuxigo.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/d2bf7a0c-cd11-45d4-8b48-5e37d5aaf73d/42036433048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097363f5-177f-485c-bf1f-2facf61c9710/making_music_74_creative_strategies_for_electronic_music_producers_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548d1dad-1c44-4946-a26a-40b2efb307ec/dukopidogesejovazesizime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42945453-955e-4f75-af34-d3760cb5fd70/how_to_outline_a_novel_wikihow.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/malayalam_movie_latest_box_office_collection_report.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/biological_determinism_examples_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/famesegav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c099d5db-c137-47a2-90c1-1fb645806237/what_you_mix_with_crown_royal_apple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb27f7bb-fd81-4759-b4eb-dd9bfcda93ea/que_es_un_manual_de_funciones_y_procedimientos_en_una_empresa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9527d538-4eea-40ec-accb-fa1803a037c5/69972004350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf58c7ca-27be-4c97-9a6a-7903e282a571/dr_heidegger_experiment_discussion_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b84eef-11c6-47e9-b16d-1c5f65a8db58/are_craftsman_torque_wrenches_lifetime_warranty.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_off0001182d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 5492 bytes
SHA-256: 5086bc6b1cdcb83b1d0c5436a8c0c56f5fbd1ab5efb2b80f1ef0b38516d1066e
font_01_sfnt_off00012ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC7 11208 bytes
SHA-256: fd6ec22e281f8bf415598956a0300fd75dc5fdc1c208c75162523af13f8503f2