Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d42be3cec1cfa9…

MALICIOUS

PDF

67.3 KB Created: 2021-03-19 12:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6527cffccfefd2b3ef509d83a68b8cd5 SHA-1: 7c3423d896bb114f37b7986458f2ed02ea62134c SHA-256: a9d42be3cec1cfa9121e10c4e790a84aeec5e6b2193bf15a6eac13a6de9e43cd
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with a high concentration of them pointing to disposable domains or suspicious subdomains, suggesting a link farm or redirection mechanism. One notable URL, http://getbuiss.online/vc_redist_2013_x649uvp9.pdf, appears to be a lure for a software download, which is a common phishing tactic. The malformed stream length heuristic also indicates potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jacksth.ru/wix?keyword=pho+777+menu+castle+rock PDF link annotation
    • http://getbuiss.online/vc_redist_2013_x649uvp9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_6039d3624eae4.pdfIn PDF document text
    • http://natnat.fun/24641611115rsnol.pdfIn PDF document text
    • http://gratoramaa.website/bhakti_movement_upsc1i19o.pdfIn PDF document text
    • http://hurleyshamburgers.com/fagut7l4jw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476766/normal_5fcbceda5b0c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385228/normal_5ffc33942ada1.pdfIn PDF document text
    • http://presentinsta.site/89165433161a0ij0.pdfIn PDF document text
    • http://janipuwibir.mywebcommunity.org/institutional_capacity_development.pdfIn PDF document text
    • http://003-center.ru/choice_is_yours_stick_figure_letra_espaoltwaw9.pdfIn PDF document text
    • http://myshoes.moscow/14503043869r9dte.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_601f17329161d.pdfIn PDF document text
    • http://axecheat9.xyz/9243969125tjzma.pdfIn PDF document text
    • http://rankingcoach-seo.com/12620617437d0sht.pdfIn PDF document text
    • http://mini-camera-super.club/anki_overdrive_fast_and_furious_vs_starter_kitnnmv6.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/woneketelak/stay_tuned_for_more_information_deutsch.pdfIn PDF document text
    • http://mufolebupasudol.rf.gd/bible_study_for_couples.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/86873338144.pdfIn PDF document text
    • http://kobewanen.rf.gd/tejisatosapu.pdfIn PDF document text
    • http://zofutigo.epizy.com/bridgewater_pure_alpha_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/capoeira_songs_lyrics.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_off0000c9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D8 5184 bytes
SHA-256: 4b8d69e33c54388cb01c3f747ffada5c62bfa24806e20dd7a81001f77ece6711
font_01_sfnt_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 10852 bytes
SHA-256: ed1c1a8a0bfd74428cafa50f7ef932bdd908dec4ecedae72e5e91c8a7802309d

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