Malicious PDF — malware analysis report

Static analysis result for SHA-256 02d985b5dc7ffe19…

MALICIOUS

PDF

75.8 KB Created: 2021-02-22 05:22:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6540e3dad7caa9bc4b5e07aa67ba9d6f SHA-1: ffd48012623b78e7752907ec8f43fb5ea04a41ce SHA-256: 02d985b5dc7ffe192231fa4dd3f914e5e25ab2ce4016372e1a4588761426ac4e
184 Risk Score

Malware Insights

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

This PDF file contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure for 'smart board software for mac free download'. The presence of multiple disposable domains and link farms further supports a phishing or malicious redirection campaign. No scripts were extracted, but the primary attack vector appears to be user interaction with malicious URLs embedded within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=smart+board+software+for+mac+free+download In PDF document text
    • http://nepujimab.22web.org/r_o_full_form_in_voter_id.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/5913503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_601562cd0403e.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/jbgckjD/manuvivemazar.pdfIn PDF document text
    • http://kpovli.ru/chrome_version_727thyw.pdfIn PDF document text
    • http://andyhong.blog/gulebovexekuwosamuxonaozihg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461748/normal_6022058cf3ae9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422137/normal_6003adb959dd5.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/R6gf3Sl/budegulidepugevu.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/hfMzhR5/marco_s_pizza_in_arizona.pdfIn PDF document text
    • https://cdn.sqhk.co/besiwowegin/iighkLO/war_in_space_game_unblocked.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/desekusoxi/cavallo_riding_boots_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/5151243549.pdfIn PDF document text
    • http://jujewubimowe.rf.gd/nobuvan.pdfIn PDF document text
    • http://titesixa.rf.gd/76091193607.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/48646860333.pdfIn PDF document text
    • http://fujeximadotut.rf.gd/57838748247.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/50214134502.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 5504 bytes
SHA-256: 14348fbb1c1cc8529febd4e5705cb28b1ae4d8258a1da14461b398f258ebfa6b
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 11184 bytes
SHA-256: 31f4bb0b2f93558dd0253fabad6cbeba266fda7fd40fcb400b1eadd7fe502703

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