Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f79b4f58e10751f…

MALICIOUS

PDF

83.3 KB Created: 2021-03-14 23:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: db76be71ec1dbb861d7fd258af528fb2 SHA-1: bef7ceb1b4a71ef83f0e482bab29d187f3c72a4b SHA-256: 3f79b4f58e10751f2ac7bff47560853d82f179170f5c10bdba820c4a2ba18ff1
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. One of the embedded URIs, 'https://midufefew.ru/wix?keyword=spotify+premium+apk+free+for+android', indicates a lure related to software downloads. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=spotify+premium+apk+free+for+android PDF link annotation
    • https://cdn.sqhk.co/nakunadubux/xzuTqhg/allity_e-_learning_login.pdfIn PDF document text
    • http://fefogumok.22web.org/astro_first_hantu_kak_limah.pdfIn PDF document text
    • https://cdn.sqhk.co/zafazegig/digNziJ/hangover_3_best_friends_meme.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/nifumqns4o.pdfIn PDF document text
    • http://workshop-fb.ru/torijugexukovukawepasewqyv1r.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/sghgjhe/evacuation_map_sonoma_county_shady_fire.pdfIn PDF document text
    • https://jimixinig.weebly.com/uploads/1/3/1/1/131164312/e1e08.pdfIn PDF document text
    • http://artdebug.site/xipitokolodugowadozorwjmqx.pdfIn PDF document text
    • https://cdn.sqhk.co/tawavumazo/ijcjaie/zelanaseragojibotafepuva.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/rojugudalofex.pdfIn PDF document text
    • https://rusolozotiwar.weebly.com/uploads/1/3/5/9/135992237/1d93e.pdfIn PDF document text
    • http://ogranicbio.fun/c_primer_5th_edition_by_stanley_b_lippman9lllv.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
    • https://uploads.strikinglycdn.com/files/3115056b-739e-4ae9-b053-5f6aa18f6aeb/maytag_fridge_repair_near_me.pdfIn PDF document text
    • http://xerozodofuvu.epizy.com/starbucks_almond_milk_frappuccino_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2454c60b-2874-4fe8-a399-c8da01489103/pajejomiguliguxeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d04e1c1-fa7c-4ada-8d39-6f8d42d95f71/is_deepak_chopra_vegan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/841d0e36-5ccc-4bee-b024-86d97d10f9cc/best_innovation_ideas_in_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e780dd-8ee1-4ca3-97b8-12fb13420d3f/ejemplo_de_monografia_corta_para_nios_de_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c53551-7d04-4b92-82d2-ef2d0ce2ab48/do_dunkin_donuts_flavors_have_sugar.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_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 5128 bytes
SHA-256: e8bc9a6d8299baa5583ebb676eaa6e2dc6760ee9b8e4599d4080feb8e7330021
font_01_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 11836 bytes
SHA-256: 67eedc91405720e6596e28d200ec114990e2fd52fcdd084c5f0656d0febfa4d2
font_02_sfnt_off00012fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c