Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1e28ac0429ba7b…

MALICIOUS

PDF

90.3 KB Created: 2021-02-20 07:05:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 4d246b8c2c4cd69647e624c64adfa553 SHA-1: b5cdd325b965800001d0d0a541cf67a30982ce5d SHA-256: ed1e28ac0429ba7b406e848577081ac94b77371de98b5880ca47f01daa595276
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified numerous external URIs, including a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to educational content, likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=enthalpy+change+worksheet+with+answers PDF link annotation
    • https://cdn.sqhk.co/nupegefozub/iahj9BO/virusujizexosorebiwodol.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/URZgMoC/deralose.pdfIn PDF document text
    • http://50offshop.info/99290417509ssbk4.pdfIn PDF document text
    • http://topstudy.fun/57502388304297nb.pdfIn PDF document text
    • http://rollernefritmassage.xyz/532455624661r6fg.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/fkhfwCP/color_picker_tool_upload_image.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/gfgiigO/faforifosesebax.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/jdjeifT/fagavifetevi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://fufabufitilaf.epizy.com/21469026299.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/bedomolotebitinosikanogi.pdfIn PDF document text
    • http://kerakuwopimarin.epizy.com/barreras_comerciales_no_arancelarias.pdfIn PDF document text
    • http://mulisemovilunud.epizy.com/regogarowuwekolikevelix.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/vominigura.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/video_bts_fire_mv_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/vsphere_web_client_6._7_free.pdfIn PDF document text
    • http://wiwesokowam.epizy.com/metformin_er_500_mg_osmotic_tb.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/18861893263.pdfIn PDF document text
    • http://xelurutokige.rf.gd/wugobaj.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
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 5408 bytes
SHA-256: 0ca64bd2d61d6dc130b437f55d5569dcbae349fae244e741714af809029b17c1
font_01_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 8732 bytes
SHA-256: 39402655a7b89df531bec1f4b1351ec6a175bb18491ad7686e9dfd37c526ab47
font_02_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 10168 bytes
SHA-256: a48a50b9c0dc58ac16bbbbf3468fb16db231c1ed61db9dfaf7d5ce73bcad87c1
font_03_sfnt_off0001459e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459E 16180 bytes
SHA-256: c22205febc7ab4b31fb38d310268dab5269d65c17e02b519822b3d5e5c1ad5d4

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