Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3e12c7f3ad7135…

MALICIOUS

PDF

75.3 KB Created: 2021-03-20 15:04:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2323b2be2fb4ca994dfdbb20502a1a6d SHA-1: 201999e5dac70d423d9003d8e4b5b01f1af6087e SHA-256: cd3e12c7f3ad7135421c66efebd1312d5b0214c2b0b10d5577383afff22f622f
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, a technique often used to create link farms or direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/aws?utm_term=how+to+pair+bluetooth+sony+xplod
    • https://cdn-cms.f-static.net/uploads/4455894/normal_601704546e26a.pdf
    • http://baby-slings.ru/us_postal_service_international_rate_calculatoroli5b.pdf
    • http://astropsychology.site/multiple_regression_analysis_in_jmpwfidg.pdf
    • http://delaem-sami.online/nufojawebesimerodetele4x391.pdf
    • http://instapriz365.online/wifofufiravidujusaf95mrp.pdf
    • https://cdn.sqhk.co/poronujefino/hjidRge/counterparty_credit_risk_eduardo_canabarro.pdf
    • https://cdn.sqhk.co/puxedepobe/0jC22Zx/creative_destruction_definition_in_technology.pdf
    • https://static.s123-cdn-static.com/uploads/4420014/normal_5ffdc01259231.pdf
    • https://static.s123-cdn-static.com/uploads/4426830/normal_6004b2e3dbf50.pdf
    • http://euroshopme.site/fairy_themed_birthday_party_gamesbzc92.pdf
    • https://cdn-cms.f-static.net/uploads/4445558/normal_5fd171502e037.pdf
    • http://wikuseweluwi.iblogger.org/insomnia_symptom_questionnaire.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/744a8717-f001-4e2d-90e9-0d86663d254e/nerudigenorezenibavebuzev.pdf
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_57dcd84e1f6b4d9a99af62a728c4f01a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/29cf81d2-14d5-4492-b913-5be5738b7d10/43397606436.pdf
    • https://uploads.strikinglycdn.com/files/fcbed83f-d735-4211-b746-9374397aa1ee/griffiths_introduction_to_elementary_particles.pdf
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_81e4a8be1ea84d339dd50584f98574fc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b09601da-cd50-4fc9-af34-dd56b5f57ba6/jogeximanulab.pdf
    • http://minofadejewezup.rf.gd/serrated_polyposis_syndrome_guidelines.pdf
    • http://rinexabe.rf.gd/exploring_physical_science_1977_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb11.bin
2ff53e779fb5f8f2acaf64f3d81d722e3c7da95638a7cbb894911f18469ec881		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 5408 bytes
font_01_sfnt_off0000fd79.bin
c08ec5940c908b9db3a3f8c13ffb8692ff53063dc4ab2a14d3df765a6b2b007e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 10048 bytes

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