Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdd5ce7d0759bdf…

MALICIOUS

PDF

78.0 KB Created: 2021-04-07 19:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4f3177579c527286b50ff51b87513c05 SHA-1: 58cb4a64b215bcc611f4a67cd60ed93e4164e963 SHA-256: dbdd5ce7d0759bdfc89af50d62e51320f6f0bb2160388579a74571dd3e6deaf2
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://resalured.ru/wix?keyword=exerpeutic+aero+air+elliptical+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494147/normal_5fca91c85c4f1.pdfIn PDF document text
    • http://xabidewukolesas.66ghz.com/kifux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5fd9edd119573.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5ff4de15c8349.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387036/normal_5ffb68f403a1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_605dade2e27f5.pdfIn PDF document text
    • http://zalavovira.22web.org/89615727999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_60175e5799ded.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/lezopobigeza/bersa_380_models.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/business_writing_for_dummies_amazon.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_a961fd294833440996aa677d4b662d54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagubip/30468744960.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/credit_report_definition_in_your_own_words.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/wimelaviruwis.pdfIn PDF document text
    • http://jefesipi.rf.gd/fovinonejoxudatovidabu.pdfIn PDF document text
    • http://bifutebapeji.epizy.com/multistage_amplifiers_lecture_notes.pdfIn PDF document text
    • http://rivejekab.epizy.com/mijazafijekorukamafi.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/how_to_make_circle_labels_on_canva.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_e856e7aa847240358433b42512deb02c.pdf?index=trueIn 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_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 4924 bytes
SHA-256: 2f4dd30cc497acbb86753a4b0fc1b6110413a3ed270df6e2bed41151fffc186e
font_01_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 12500 bytes
SHA-256: 85d710c66a437b55ab590b38476659c7e6198b053474c7ffa01177e02bb5cb26

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