Malicious PDF — malware analysis report

Static analysis result for SHA-256 28663e0a8a5c7501…

MALICIOUS

PDF

79.3 KB Created: 2021-02-24 12:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: de58ae312c5806d9938d0fa257fc1086 SHA-1: 21bdbd3112c5617fdf057e4702513cd31e7c1abe SHA-256: 28663e0a8a5c7501e97040a08f0822215d38d9ec6fabe8a4d29f4b1bd954ca8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the malicious intent through a large number of links on potentially untrusted hosting.

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://jottigo.ru/strik?utm_term=what+is+the+theme+of+diary+of+a+wimpy+kid PDF link annotation
    • http://fusakorupisizeg.iblogger.org/metallica_nothing_else_matters_lyrics.pdfIn PDF document text
    • http://firstdoctor.xyz/29849969674bv4k1.pdfIn PDF document text
    • http://raifaisentgo.online/59310172457kf12a.pdfIn PDF document text
    • http://topsol.xyz/la_guerra_de_las_cien_horas_con_hondurasyuqol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460446/normal_5fe2b5165256e.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwezomu/hgibhe9/bts_piano_army_tiles_kpop_magic.pdfIn PDF document text
    • http://ourfutures.space/visebo3ls86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_602daa59c862c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377662/normal_5feb4a35175b7.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/gebXRia/25383551171.pdfIn PDF document text
    • http://edaruzal.xyz/lanutijjf2.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/xades_puzenikapaveze.pdfIn PDF document text
    • http://copyrightsupporteds.com/fukutarevalulenula1vilh.pdfIn PDF document text
    • http://premial.su/gurosixugafenugizagunumi9j9jg.pdfIn PDF document text
    • http://nout-prodat.site/kochi_rajavu_malayalam_full_movie_download8vzt6.pdfIn PDF document text
    • https://vujewixijul.weebly.com/uploads/1/3/1/4/131437312/xatirej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maviwapas.epizy.com/10553682106.pdfIn PDF document text
    • http://kapivuvarebe.rf.gd/66458382625.pdfIn PDF document text
    • http://dovuxomumebajip.epizy.com/echo_gt_225_weed_eater_manual.pdfIn PDF document text
    • http://kukatunudivolu.epizy.com/audio_beats_pro_apk_gratis.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_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 5520 bytes
SHA-256: 96e53a2253e9a6e192ea3eb315644d928f0fd9e57db9173907f7e143a43f6d9e
font_01_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 11472 bytes
SHA-256: acb7c4d9c49ef813f69c9e39dd7faf648eacd6f5caa90223c152877577096a30

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