Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afc5f7e29b09f41…

MALICIOUS

PDF

138.2 KB Created: 2021-06-03 05:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b7e41cc408423bd397cad286bbbebfa SHA-1: dcd59051527d9e6cd075a8d065edfb16cd31bea6 SHA-256: 9afc5f7e29b09f41808a41b2f997c184fc7ba3517f01a5783a017e7d56071f29
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URLs, including those hosted on weebly.com, suggests an attempt to direct users to potentially malicious content or phishing sites. The document body is heavily obfuscated and contains metadata that does not provide clear user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/123?utm_term=akai+apc40+mkii+manual
    • https://keroxoxelesiz.weebly.com/uploads/1/3/1/4/131452869/5776546.pdf
    • https://rusolozotiwar.weebly.com/uploads/1/3/5/9/135992237/6179494.pdf
    • https://bawobejeburojax.weebly.com/uploads/1/3/1/1/131163695/7be8a.pdf
    • https://rereviraret.weebly.com/uploads/1/3/4/5/134512362/gagizesafagisag.pdf
    • https://cdn-cms.f-static.net/uploads/4492250/normal_60446616153bb.pdf
    • https://jowukore.weebly.com/uploads/1/3/4/8/134870909/dazajupa_katatasanikiku_zoduwad.pdf
    • https://norudajesopoz.weebly.com/uploads/1/3/4/3/134340776/838724ee99e4.pdf
    • https://movakesomerinid.weebly.com/uploads/1/3/4/5/134528648/fowevagotawejixuj.pdf
    • https://static.s123-cdn-static.com/uploads/4420775/normal_5fe22e66eaf23.pdf
    • https://pokifuduxorimib.weebly.com/uploads/1/3/4/5/134501468/8130533.pdf
    • https://faxasuxudoxo.weebly.com/uploads/1/3/2/6/132695360/ddadd0d6cad.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pevozowo.pbworks.com/w/file/fetch/144424260/34855601878.pdf
    • https://uploads.strikinglycdn.com/files/07e7fe4b-1946-4c4f-9e3a-082e1a7b1fd7/60625302323.pdf
    • https://uploads.strikinglycdn.com/files/5e75e645-1486-4fb2-8b5b-f455f796cc1d/lazarillo_de_tormes_3er_tratado_resumen.pdf
    • https://uploads.strikinglycdn.com/files/864aa68e-b917-476a-9f99-e8c4b89aa009/89035123605.pdf
    • https://uploads.strikinglycdn.com/files/889be099-e794-4528-8112-fdba626cf1b3/85832810035.pdf
    • http://lomubel.pbworks.com/f/american_beauty_full_movie_480p.pdf
    • https://uploads.strikinglycdn.com/files/7f7e5412-4925-48aa-bf53-7a451982f135/42746933604.pdf
    • http://wiwedano.pbworks.com/w/file/fetch/144427476/calendario_lunar_para_siembra_2020_colombia.pdf
    • http://xojifot.pbworks.com/f/gisokawigoneritexulula.pdf
    • https://uploads.strikinglycdn.com/files/692f9dd6-3fc6-42e2-ab19-8a1647fdc4f6/vewufapobibofosifosudusep.pdf
    • https://uploads.strikinglycdn.com/files/96966d48-f96e-43a5-be66-bd15f829e5ec/what_is_an_invasive_species_in_an_ecosystem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d007.bin
756ef5374b1612c9e7b10d43b8b98ee1d70b3e73bd8554630b6c36d9013d3933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D007 1828 bytes
font_01_sfnt_off0001d8d8.bin
8d5a44767d307cd4e20675e4b735337a3d24d531900370d8a0e01cd14dcecfc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8D8 5088 bytes
font_02_sfnt_off0001ea25.bin
004895b67af9026fa00dae1784b47a1be1efd922ff5274c1e1988b09d1a718a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA25 16024 bytes

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