Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e39f4aa8a120fbc…

MALICIOUS

PDF

77.9 KB Created: 2021-03-22 02:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6cdb2bfe5dbdbcffdfbf6188446207b5 SHA-1: b55c567075d99ce60a3fae07f682ef549ae4f1c1 SHA-256: 4e39f4aa8a120fbc0f32a553c111c59fc75643fc8ca147ba4e6312e6b2ba93c0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked PDFs.

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.
  • 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://lozipotod.ru/award?keyword=cardo+santo+propiedades+pdf PDF link annotation
    • https://lubojedibejet.weebly.com/uploads/1/3/5/3/135329630/sotiton_bamesovubuteg_zitoxetufera.pdfIn PDF document text
    • http://help-bluebadgecenter.com/leligodonubugobatokoja6ypbk.pdfIn PDF document text
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/6467744.pdfIn PDF document text
    • https://tatamanigo.weebly.com/uploads/1/3/5/2/135299517/fefusigudurejemu.pdfIn PDF document text
    • https://duwelivupegated.weebly.com/uploads/1/3/4/7/134711348/setidawejuwigik.pdfIn PDF document text
    • https://movalolutipala.weebly.com/uploads/1/3/2/6/132681002/a3738603d160d.pdfIn PDF document text
    • http://poopo.ru/how_to_get_freckles_naturally_with_lemon_juicea1pur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_603ebea4c8b95.pdfIn PDF document text
    • http://my-favshopg.online/45421942458tedxb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_6020aea1b4a8a.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/7641629.pdfIn PDF document text
    • https://koxowugazetumul.weebly.com/uploads/1/3/6/0/136015765/7672832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_6022f079024d5.pdfIn PDF document text
    • https://mesowusiwa.weebly.com/uploads/1/3/5/9/135975120/ronedituvevesew-watuzisin-munax-befoja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwulagad.epizy.com/vogatutagozijubemunufosi.pdfIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_d13f9ca2bb8b4d48b0500a5dad067570.pdf?index=trueIn PDF document text
    • http://ropugefax.epizy.com/9900649017.pdfIn PDF document text
    • http://sizesetuxuw.rf.gd/15445267080.pdfIn PDF document text
    • http://wikatefa.epizy.com/shipping_label_template_ups.pdfIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_7ffaf0de5e174e81bf0fb73b078e5ade.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 4908 bytes
SHA-256: 1cca1e63d4ffebfa7f5ff35ae42980bd8113ace0e652067e166f4e67ab30c6d9
font_01_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 12908 bytes
SHA-256: 612e4e297a7b733a0046bfe100ab9b80d560cced8ca9638a78a707f1f811ac24

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