Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0053524e83fa11…

MALICIOUS

PDF

87.0 KB Created: 2021-06-08 20:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a923d13b8eeceafb34d08950f9763a8d SHA-1: c900fd72a7e38df0811dae532de3d201cebc7531 SHA-256: df0053524e83fa11dfdcb12d39869fdefc1fec2729216a94485f001f5bde0707
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination or host malicious content. The primary URL, https://nomylo.ru/pbw?utm_term=factoring+quadratic+equations+worksheet+with+answers, is likely part of this scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/pbw?utm_term=factoring+quadratic+equations+worksheet+with+answers PDF link annotation
    • https://zepemotofilizag.weebly.com/uploads/1/3/5/3/135399015/6774514.pdfIn PDF document text
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/7698872.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144421977/the_art_of_multiprocessor_programming_solutions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb13997-1d0c-4b68-87a7-b97767c47512/72125105584.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144415284/hidruro_de_calcio_nomenclatura_iupac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d9b0ee-47ec-4817-9027-30299cf1af51/definicion_de_un_vector_en_r2_y_r3_ejemplos.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/w/file/fetch/144768027/10806007306.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/f/lutipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac289c2-6366-4574-ab6e-0a6ce90a1858/acer_aspire_e_15_i3_review.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/28_weeks_later_full_movie_in_hindi_dubbed_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a12d6de-2353-4188-b17e-131dd96fe45a/what_is_the_most_successful_roulette_strategy.pdfIn PDF document text
    • http://pimepovume.pbworks.com/f/86005477120.pdfIn PDF document text
    • http://litorabi.pbworks.com/f/word_to_converter_free_download_windows_7_64_bit.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144546078/rainbow_six_siege_charms_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b1af3b4-c549-42c5-b1d6-93317e029dc1/ina-w900_bluetooth_pairing.pdfIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144476652/56825855641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79fdc6e-7e97-4100-bc7b-b2937fc389f4/s10_4x4_v8_conversion_oil_pan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa42f580-8f5a-4c56-beba-b203ad998e5b/filosofia_de_heraclito_de_efeso_resumen.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/w/file/fetch/144512445/happy_wheels_online_full_version_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b912bc61-a7b3-42e0-afd9-e5906d58ba3d/suredik.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/57878815565.pdfIn PDF document text
    • http://bekiravetad.pbworks.com/f/the_way_up_to_heaven_dahl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb29dcf-7a5c-4504-bd80-80251ddb2f95/57556808584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668959f0-7590-408c-b846-1fd64526ffc7/4045805590.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144465312/72429217468.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/street_fighter_4_all_unlocked_apk.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/w/file/fetch/144627015/xorozagevuzovanogibikudi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 5288 bytes
SHA-256: ecbcb6a7de4f1c210ca029ddc5d8c7a89a1ab609f34edb709865efdf3ca6c7a6
font_01_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 11636 bytes
SHA-256: 4b7f216efe5139d84128cb1c642676aa040799c7c9dfe12d683ffce0939b0d06
font_02_sfnt_off00013f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3