Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd4771912811d7a…

MALICIOUS

PDF

87.7 KB Created: 2021-04-02 05:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 080be9b6ba6827f11c88752f3e0198fe SHA-1: 03c67ca93e22f2a85b261861917c5a10d76f9284 SHA-256: ccd4771912811d7a3640d98ab1cfecf65c3431e245d68f6f5ac7a31c6b43e9e0
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution attempt, likely using a lure related to search queries.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://bologen.ru/aws?utm_term=what+date+is+mothering+sunday+2020+uk PDF link annotation
    • http://salearea.pro/begopuwiweryq57.pdfIn PDF document text
    • http://pelistens.xyz/experimental_probability_worksheets_grade_74l86r.pdfIn PDF document text
    • http://pugumatinudozid.iblogger.org/nirunegomawev.pdfIn PDF document text
    • http://pifovabu.getenjoyment.net/collaboration_in_inclusive_education.pdfIn PDF document text
    • http://kanshoper.site/report_fake_social_security_administration_calls9tt03.pdfIn PDF document text
    • http://ziximotizaned.medianewsonline.com/8753823899.pdfIn PDF document text
    • http://juvizex.sportsontheweb.net/20155908778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rulufegelaz.rf.gd/geotechnical_engineering_lab_manual_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e76b44-07f2-4024-944f-4b31abf93d02/idiots_guide_to_climate_change.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_e63eb5fa6b05407cab4fd6391274773a.pdf?index=trueIn PDF document text
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_c762af9967234cf18a47f3a6a7d75d56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9aaa0f4-9721-4401-8904-482b9c23992e/jam_voice_speaker_instructions.pdfIn PDF document text
    • http://tesalivolanimeg.rf.gd/bhoomi_film_all_songs_free.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_de355f1b543e4dc9affdbc1c1b49556d.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_dea1cd05dd9743908c6d32df44903eff.pdf?index=trueIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_5a34547abadd438b9c652c481bf14bd2.pdf?index=trueIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_25fe56baddfd4d1781c8bc532ae337ef.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_off00011886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 5660 bytes
SHA-256: 54171955af3aef7fed8d3b1f9e9fbdc2295bd4b006c07c6226fa88a8117c03bc
font_01_sfnt_off00012bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAD 11832 bytes
SHA-256: 7b11c77a20332281d6f5eec2460e8334bc0e1ae1a402bb0fad4ae34e79877557

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