Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d8bd1c1079669d…

MALICIOUS

PDF

82.4 KB Created: 2021-02-06 09:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5a9b53adeb2ee44ef3a3d7feb82a7377 SHA-1: ce0ad188e539be7f5b5e2ef8b0ce3e66c03a4c9c SHA-256: 13d8bd1c1079669d300abab8ff2f11f8034505d63a196bf423cbbc4e2a0a7141
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to academic information, likely to trick users into clicking the embedded URLs. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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 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.
  • 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://seumenha.ru/wb?keyword=aiou%20date%20sheet%20spring%202019%20ma%20islamiat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369911/normal_5fde4291a90e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_5fd32adac6f0c.pdfIn PDF document text
    • http://healthit.space/tilefawotaoersj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456420/normal_5fe80213787db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_601a584012e02.pdfIn PDF document text
    • https://cdn.sqhk.co/pewovixosafu/jj09vwe/xojebi.pdfIn PDF document text
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/nazep.pdfIn PDF document text
    • https://pedogore.weebly.com/uploads/1/3/2/8/132815008/606e6a0e72d.pdfIn PDF document text
    • https://sadavofabuloxus.weebly.com/uploads/1/3/5/3/135316226/dopodivati.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450354/normal_5feeb68f8011c.pdfIn PDF document text
    • http://takipleskazan.org/hail_the_king_espaolep4sh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/86794806479.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/52496189670.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/sozazejipudusutaje.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/lower_chesapeake_bay_fishing_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/kemaf.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/letra_cantos_para_difuntos.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/23332773545.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/brass_band_sheet_music_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/bengal_tiger_movie_telugu_hd.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011500.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11500 22888 bytes
SHA-256: 7fd452e8dba6406e90392b613b5a78e617879b857abe9f745a41476bccf0283c
font_00_sfnt_off0000dc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 5844 bytes
SHA-256: 253888b5c13583530806de1df45744eb373f01a9f35d571339d19e20e827b924
font_01_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 10780 bytes
SHA-256: ce3c650c62b4f1a1e44c073aab96505e0880258bf5d0d3db3ed609460d1e2db8

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