Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c823773f7604814…

MALICIOUS

PDF

74.9 KB Created: 2021-04-02 10:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e4e71ad99abdb702af3426bc4583229a SHA-1: 335f529b03b3621101c73784fc37ff332382e299 SHA-256: 2c823773f7604814cf5a8cb6450e15b3e1044f37180cda2aea5b004c07c4e526
126 Risk Score

Malware Insights

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

This PDF file is classified as malicious, exhibiting characteristics of a phishing lure. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be related to software downloads, reinforcing the phishing pretext. The presence of embedded URLs and the ML classifier's high confidence score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=microsoft+office+2018+free+download+full+version+for+windows+10+with+crack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371003/normal_604b847f7430f.pdfIn PDF document text
    • http://zespodsvetkoy.site/typical_cross_section_of_roads_in_urban_and_rural_areas81c8u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482208/normal_602bed09bf17b.pdfIn PDF document text
    • http://wwbook.org/7513053737265aca.pdfIn PDF document text
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/6937192.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/hdFifge/evolution_movie_netflix.pdfIn PDF document text
    • http://wtia.space/how_to_cite_sources_in_chicago_stylekiyby.pdfIn PDF document text
    • http://profapp.pro/17255166010f7nyg.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/fTOupK0/zusegakixesilul.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/vaderujug3zc81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421478/normal_6028e380c5291.pdfIn PDF document text
    • http://prizinsta24.online/trissels_injectable_drug_handbook_onlinemeotx.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/9540803.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/the_man_in_the_high_castle_trailer_italiano_stagione_1_episode_3brpdr.pdfIn PDF document text
    • http://appeal-ig.com/how_to_schedule_the_fe_examdc1z9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_2055b9ee2ad74396baa1ae60046a469a.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_4f2d6f2a8eb44616aa628ccfdd6c1a86.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_3788f6f7e211423e842ae42f151d0960.pdf?index=trueIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_796670b3f06748728752b9deac3e2809.pdf?index=trueIn 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_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 5848 bytes
SHA-256: 052fb6e63329478d192b6266499506bcd950f43224600b7539bdac12392f653c
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 10684 bytes
SHA-256: a091f06d3f44b05525ae3ebebbda894fec04cd97d1aff52f83621cf417a9fab7

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