Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec101443bd57d07…

MALICIOUS

PDF

84.7 KB Created: 2021-03-03 06:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5f82a38e9f984b838744e310bcdd7d07 SHA-1: b6cd10665502dddcffcce2539ee8f9ac2e7e176f SHA-256: dec101443bd57d073eb64d95cbfee975245594b750057497d9e575bc479a13ce
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a critical heuristic flagging a mass of external PDF links. The document body, though heavily obfuscated, suggests a lure related to 'origami instructions easy ninja star', likely to direct users to a network of malicious or SEO-spam sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://golowaki.ru/award?keyword=origami+instructions+easy+ninja+star PDF link annotation
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/06756913a54.pdfIn PDF document text
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/biwuzitifoji.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/94323495816.pdfIn PDF document text
    • http://trokot-shtorki.online/44140247570f8tpf.pdfIn PDF document text
    • http://opssmall.space/fokaxevv2ot5.pdfIn PDF document text
    • https://rajarajo.weebly.com/uploads/1/3/1/3/131398110/9564505.pdfIn PDF document text
    • http://domobifotuza.sportsontheweb.net/setina_partition_installation_instructions.pdfIn PDF document text
    • https://wuxebejodivo.weebly.com/uploads/1/3/6/0/136030931/majusonisusiko.pdfIn PDF document text
    • http://aycotoro5.xyz/nazurovuwunadexosuxazopu430hr.pdfIn PDF document text
    • https://rovagurepuj.weebly.com/uploads/1/3/1/8/131856033/tapomibivitixoba.pdfIn PDF document text
    • https://roribevewo.weebly.com/uploads/1/3/4/5/134502196/gemotiwepot_bufib.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/9010168.pdfIn PDF document text
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/mepekoseguwe_katurunarutiwob.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/povelenavuviw/44131715219.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/android_set_animator_duration_scale.pdfIn PDF document text
    • http://nevabaza.atwebpages.com/family_therapy_with_dr._jenn_brittany_dejesus.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/pudutamolekowa.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/mecanica_vectorial_para_ingenieros_dinamica_10_edicion_solucionario.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/61244049005.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/spotify_brand_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/axiom_61_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/ribimadukasojipiz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 3628 bytes
SHA-256: 92564bae3d68625f1e245c5a229721996ec524755836e632fcb317a5325fd4b9
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 5292 bytes
SHA-256: 22a3767435e843670ef2b0b2cbd0dcfc4817aedd7b1a383e4185647c89b9707c
font_02_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 10220 bytes
SHA-256: bad98b196854fb79ac89f65134f32089b707e070be5b573332ad326e648c75ba
font_03_sfnt_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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