Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ed4b2dec9c20a0…

MALICIOUS

PDF

73.2 KB Created: 2021-01-24 22:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7c340b903dc3d9bafc886eaf667ccb07 SHA-1: 06359b559a51db5d82ddb30f416c3b8b3aa460c3 SHA-256: 49ed4b2dec9c20a0ee230d1c4a3b83e408e205730cfbfd396cb41ab26111f53d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 or redirection scheme. The presence of external URIs and the 'link farm' heuristic indicate an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=milford+nh+teachers+contract PDF link annotation
    • http://dofegogojewipo.iblogger.org/wufadudefurolevuk.pdfIn PDF document text
    • http://vatemuredaxusob.22web.org/jegemomikivebojof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470014/normal_5fe7c7ea9e8fb.pdfIn PDF document text
    • http://prizinsta365.site/toilet_running_all_day_water_billj813f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_600baf9ed7337.pdfIn PDF document text
    • http://storedubai.shop/windows_server_increase_remote_desktop_connectionsxwboz.pdfIn PDF document text
    • https://ruregogawumol.weebly.com/uploads/1/3/2/8/132815787/589842c.pdfIn PDF document text
    • http://samyog.ru/apple_classroom_for_mac44vgk.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/lipuzoje-punox-gewidemovenuviv-deliliwelatuw.pdfIn PDF document text
    • https://jebomifodav.weebly.com/uploads/1/3/0/8/130874614/tedejebum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455898/normal_5ff2b9b76f23b.pdfIn PDF document text
    • http://veloxezidirexob.iblogger.org/wumelegakajulize.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/getama.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
    • http://mejizemobimoli.epizy.com/4667549936.pdfIn PDF document text
    • http://metukobitoro.rf.gd/kindle_fire_movie_file_format.pdfIn PDF document text
    • http://bunisanabasa.epizy.com/reforme_aide_au_logement_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/disgaea_2_dark_hero_days_class_guide.pdfIn PDF document text
    • http://dizutobasuxolom.epizy.com/physiology_of_hearing_and_equilibrium.pdfIn PDF document text
    • http://lamafuravufezin.epizy.com/arnold_chiari_malformation_adalah.pdfIn PDF document text
    • http://bajobakokela.epizy.com/vexaxun.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_off0000d53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53C 4904 bytes
SHA-256: 0b1d04ccf0d783b0041c18bc5581f923fb1abc7af615ab777f64c2f67e2fa5b2
font_01_sfnt_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 10224 bytes
SHA-256: 770573b4894fec09861a8ce11133a32ab37e8d5c4922a23ebdf37729e4aa850b
font_02_sfnt_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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