Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55db343aecea567…

MALICIOUS

PDF

81.0 KB Created: 2021-03-26 07:49:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8e54d9f5419e349eedfe86eb69d64a25 SHA-1: 551367aec8c806552a76062aaef36729bded20e9 SHA-256: a55db343aecea567d82252915296918826a6f68c7710372ce8be587a4e5571b1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/123?utm_term=cemal+s%25C3%25BCreya+kitaplar%25C4%25B1+pdf+indir PDF link annotation
    • https://cdn.sqhk.co/rafopaluko/8hbhdMW/22579781741.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/gegrWKg/pinigawatawebidojuwakixi.pdfIn PDF document text
    • http://mamunetosi.iblogger.org/jinofutexusur.pdfIn PDF document text
    • https://piwofenuxud.weebly.com/uploads/1/3/1/8/131871692/fivezemafiwimux_jurabifapobis_bakaxobodisegu.pdfIn PDF document text
    • https://cdn.sqhk.co/torevebeti/nAEhVaO/facebook_messenger_video.pdfIn PDF document text
    • https://wadoruzog.weebly.com/uploads/1/3/1/3/131379034/7360210.pdfIn PDF document text
    • https://nidoziba.weebly.com/uploads/1/3/0/8/130873853/7051664.pdfIn PDF document text
    • http://xumimoz.22web.org/genetic_code_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/njgjjhc/best_photo_editor_app_for_android_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/ijggjiv/7904696427.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/bijCjg9/noburalezol.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/Thidxih/pirate_parrot_craft_for_preschoolers.pdfIn PDF document text
    • https://ponivigaxuk.weebly.com/uploads/1/3/5/3/135313456/5697065.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/vJt2jjl/beautiful_butterfly_hd_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/lajojeletab/TiiEXif/movatovakopab.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/65c88b14-a7e3-4092-821c-23f7973e9821/the_hound_of_baskervilles_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e006191-3ed0-48d9-822b-824a33f87fd8/sotemedejetizavuwa.pdfIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_9babec00539945838b2aeab93495bafc.pdf?index=trueIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_2dbc82fcd2074916a11f9bd94c04fe67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab0d153-a458-4680-b84e-93271d3fc909/how_to_read_better_and_faster_summary.pdfIn PDF document text
    • http://zadiken.rf.gd/internet_explorer_your_current_settings.pdfIn PDF document text
    • http://rifusuxuro.rf.gd/is_premiere_rush_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f19cfd6-9bb4-4d4d-8d31-8d6326680f20/estudios_de_factibilidad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e686e9-21e5-4643-bfb5-1bed684557d9/wd_portable_elements_vs_my_passport.pdfIn PDF document text
    • http://naperopumo.rf.gd/povalarumajuxux.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_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 5204 bytes
SHA-256: 84a2ae87a376f7dd38f68da170731af53fe9b7e406586145d59ccfab60c23bc8
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 12760 bytes
SHA-256: 64f0e1b15d62e5d4be282c8967e48c2f5d5068248e4e1c93a316349cae10cbe4
font_02_sfnt_off000125c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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