Malicious PDF — malware analysis report

Static analysis result for SHA-256 92da204e57fc6a6b…

MALICIOUS

PDF

89.6 KB Created: 2021-04-13 19:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 36b14d93221c68775e6811f4601f9eb9 SHA-1: 77d3d098c21eef441daf6f443c7298c486291cf0 SHA-256: 92da204e57fc6a6bd98a8b3ddbbb8ac383f36f656dd5f8cf6fa9ee26560a7535
146 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback lure, prompting users to call a number for a fabricated issue. While no scripts were extracted, the presence of multiple external URIs and the callback lure suggest an attempt to deceive the user into further interaction, likely for financial gain or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://midufefew.ru/strik?utm_term=brother+se-270d+troubleshooting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479210/normal_601c8832bcbfb.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/jjdghgc/super_adventure_island_game_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485172/normal_605222d77778a.pdfIn PDF document text
    • http://tivuximuliku.mygamesonline.org/86231591258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_6068ef97b99ff.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/hfhgCTF/idle_hours_meaning_car.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490528/normal_6006e29875c9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493602/normal_5fed0a5518a28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5fe3afe759984.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/14284047910.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/tobotimis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465543/normal_600bbad9e5dc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_5ff9d064e801e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_605dc27092ef7.pdfIn PDF document text
    • https://cdn.sqhk.co/dugabolisuma/QmhgwCc/78993049872.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460066/normal_5ff9fc8270b31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kojuvurapamox.myartsonline.com/lumamopow.pdfIn PDF document text
    • http://zijurape.atwebpages.com/solid_converter_full.pdfIn PDF document text
    • http://molujafit.atwebpages.com/bevufetex.pdfIn PDF document text
    • http://jozilaro.atwebpages.com/oxford_dictionary_english_to_gujarati_free_download_file.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_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 5452 bytes
SHA-256: 115064c8f921117c133d3409fc042fd437debca5f72cf9bf36d868edc0510cfa
font_01_sfnt_off000131f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 11448 bytes
SHA-256: 9d31b86999db1179571f681288b9cb9595d41cbd1f858a5796e0e9f2f09ced72

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