Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae59d38c671497b…

MALICIOUS

PDF

72.3 KB Created: 2021-03-30 05:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f9d5f4c54b38d3f14e3bbec6715bb2a3 SHA-1: 79fcbf12fb400d156259ee761f86b6db79bb05a2 SHA-256: cae59d38c671497b284d81b2cd05e2127da6f97a144f3dbdd21b32ca90f73264
186 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, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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.
  • 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://botokaw.ru/wix?keyword=bobaloca+manhattan+beach PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420430/normal_605e141ea067a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527747/normal_5fedab80a7d7b.pdfIn PDF document text
    • https://diwolusetu.weebly.com/uploads/1/3/5/2/135299278/siginulano-sevuferomijol-zufupaluri-nitav.pdfIn PDF document text
    • https://dodukitomot.weebly.com/uploads/1/3/1/4/131407143/6c7e4e51684.pdfIn PDF document text
    • https://gopaxabog.weebly.com/uploads/1/3/5/3/135309926/disedum.pdfIn PDF document text
    • https://gazonuzurixe.weebly.com/uploads/1/3/4/4/134485976/824048c.pdfIn PDF document text
    • http://xutuvulamarav.iblogger.org/graphic_organizer_template_for_science.pdfIn PDF document text
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/5138785.pdfIn PDF document text
    • https://komamopiragi.weebly.com/uploads/1/3/4/4/134444029/dae33460f.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/betokaxufuruwam.pdfIn PDF document text
    • https://muzufuwuvul.weebly.com/uploads/1/3/2/3/132302955/42aa8696fd668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_6007efb816cc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_6016bd4851faf.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://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_54740aae6b324659a133a24bc8f02f15.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_157356ea511f4cda821cf83f5caa6c0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubefula/bapuxotejabaroxezoga.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/larasatatidaduj.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_ce72b6bde2c1449f9c26e28fd9c62529.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wejuvono/what_is_funny_to_watch_on_netflix.pdfIn PDF document text
    • http://busisaviw.epizy.com/xixitariretejidomadogu.pdfIn PDF document text
    • http://wuxigukupem.epizy.com/acca_f3_kaplan_exam_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/tv_serial_star_plus_ringtone.pdfIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_2a8ab2d61b0041d5a7ce9adc3d228b5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/wigejuwun.pdfIn PDF document text
    • http://nekezoxugi.rf.gd/hero_mariah_carey_karaoke.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_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 4692 bytes
SHA-256: 61f30b2285bbf02fa0f1abe362bdf23df1852fa4f72e9e7598a17b38abeda166
font_01_sfnt_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 10172 bytes
SHA-256: 501b0dc9d191d4ab0009edb68261dc4954a4e61e9b0c28a7557b67195871379b
font_02_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f