Malicious PDF — malware analysis report

Static analysis result for SHA-256 809c4cdd078adaaa…

MALICIOUS

PDF

94.7 KB Created: 2021-03-26 02:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7e98b5382bf4f79bc0f1aa28874d87ba SHA-1: b15d78881bcd053ab4f8fe35015a11bf2088dced SHA-256: 809c4cdd078adaaa1e5d7c286e760e9ac3b56cb9331d01a4c8e2ef41794a92cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to its generation, but no direct user-facing lure text was discernible.

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://golowaki.ru/123?utm_term=third+person+plural+form+of+ser PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487186/normal_5fd7badf4f67b.pdfIn PDF document text
    • http://rugozuravonabib.22web.org/78434220738.pdfIn PDF document text
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/5222581.pdfIn PDF document text
    • https://cdn.sqhk.co/fenogate/hdFjejb/sajemifinugoju.pdfIn PDF document text
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/6487397.pdfIn PDF document text
    • https://cdn.sqhk.co/gogadibavuta/jgiHicp/las_vegas_visitor_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/fL6hkie/silowigekamasisip.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/BzhhK2C/battleship_half_marathon_wilmington_north_carolina.pdfIn PDF document text
    • http://faxozulakevosos.iblogger.org/to_be_simple_past_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479433/normal_5fcf1a7245583.pdfIn PDF document text
    • https://jeduwisuduxib.weebly.com/uploads/1/3/1/4/131483356/sarosolagedevut.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://fomariwidodazum.rf.gd/sodadedigovapel.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/is_salt_water_good_for_healing.pdfIn PDF document text
    • http://kitakel.epizy.com/wujajezumipudazoladapo.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/39114545716.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/sasodab.pdfIn PDF document text
    • http://retelowanudugut.epizy.com/what_is_a_controlled_substance.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/gasevisedurarox.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_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 5228 bytes
SHA-256: 52ddc77b6ab36ba2a1436a4bb351102a76b205a5c3764794de4f7a7d62446a20
font_01_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 8864 bytes
SHA-256: fded783f9934e22962de9d119b29bb319f9c3e0b970a59e0e14b3726e773148b
font_02_sfnt_off00011fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 18324 bytes
SHA-256: 0fcd1a90b68e3f0437154ab1bf34f733c2e3472f9ec4dd4132125da7fddddc2e
font_03_sfnt_off00015579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15579 16324 bytes
SHA-256: ee64c5838211f548f4118dbbf84bfa715472112000cebea33904e143f8f46f9b

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