Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1528e3741c2643f…

MALICIOUS

PDF

77.6 KB Created: 2021-02-16 08:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 12b5acb13955b9111e4c7abef2ec3e29 SHA-1: c7d8d653a84aabfcbe14bee4262cd0292fe2099a SHA-256: e1528e3741c2643f13e763965f43929efaed4a890704774845130ccde581c51e
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant portion pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of disposable hosting and UTM parameters, reinforcing the malicious nature of the links. While no scripts were extracted, the overall structure and URL patterns strongly suggest a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=english+idioms+in+use+pdf+download PDF link annotation
    • http://fresh-ita.fun/ranipakef8lnr0.pdfIn PDF document text
    • http://lowuwirakob.66ghz.com/8921338490.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/iiwahiX/sobomurozaz.pdfIn PDF document text
    • http://mybiol.site/53857903944ow5bn.pdfIn PDF document text
    • http://chunyoo.com/chosen_song_whatsapp_status05lg7.pdfIn PDF document text
    • http://xapozekaxo.iblogger.org/zopomutikoge.pdfIn PDF document text
    • http://legalevi.22web.org/piscine_chevreuse_espace_forme.pdfIn PDF document text
    • http://mon-cmso.best/reforma_anglicana_resumoayzsr.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/id4cheP/23840169209.pdfIn PDF document text
    • https://cdn.sqhk.co/gizivapejoko/iejAgjb/score_hero_answers_level_207.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bedegotix.epizy.com/59339306848.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/belajar_tenses_bahasa_inggris.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/dezefuwajigijov.pdfIn PDF document text
    • http://gezewezelatemak.epizy.com/firisamuxo.pdfIn PDF document text
    • http://kepirodineloga.epizy.com/ashokan_farewell_piano_sheet_music.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/18846103201.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/tornillo_sin_fin_transportador.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 5408 bytes
SHA-256: 06b67a720908547052aa6112f0cae1e2947be51c4e60e55f4ca08152b183347e
font_01_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 10672 bytes
SHA-256: 2b8a061adb65d4100e4c78e761ec60536feeccee5560f0f9bcd4381097f3d7c5

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