Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda5558d37ddde03…

MALICIOUS

PDF

74.6 KB Created: 2021-02-16 10:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2ee7c97f75833b280732ef397447c4c3 SHA-1: 302259ecaff8be1fc81bdf1075a0a7e3fbc97f7d SHA-256: cda5558d37ddde0392624074db46925f1f66b5a71a899d8f664c007148a5e3d3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which are to benign-looking documents, but one URL, 'https://maypoin.ru/123?utm_term=windows+10+keyboard+shortcuts+for+accents', is flagged as suspicious. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common social engineering tactic to bypass security measures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://maypoin.ru/123?utm_term=windows+10+keyboard+shortcuts+for+accents PDF link annotation
    • http://pixell.store/fifty_shades_of_grey_fanfiction_ana_hospital6f5cy.pdfIn PDF document text
    • https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/zojibonurujap-denok-mujix.pdfIn PDF document text
    • http://velesvoyage.ru/english_grammar_book_class_9_10h75s9.pdfIn PDF document text
    • http://mini-camera-super.club/853889944706qti2.pdfIn PDF document text
    • http://mandarins.space/getivagatep8ibr.pdfIn PDF document text
    • http://subbellassecret.com/tamil_guide_for_class_9_2019ghy97.pdfIn PDF document text
    • https://rovonowevon.weebly.com/uploads/1/3/6/0/136051941/7611722.pdfIn PDF document text
    • http://service-hire.com/concave_and_convex_mirror_calculations_worksheetbzbu4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tixedujegibex/91249613506.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/montserrat_extra_bold_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/23811680022.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/amma_bhavani_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/canonical_form_2x2_matrix.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/72179997614.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/nizaguvutexe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 5564 bytes
SHA-256: a40145ccd7af148ed2969167723a66aabf2e20c66395bdd178796ae329d238cd
font_01_sfnt_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 10888 bytes
SHA-256: c614df4539a7086f5af1dee6422f0b5f84835e2e3f75e8afdff43ade9c2e6b65
font_02_sfnt_off00010f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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