Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68f29910b5b0836…

MALICIOUS

PDF

81.1 KB Created: 2021-03-25 10:17:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: af103763e3c7740bbe06b8bd3e111ac6 SHA-1: 485a8c720cb3cad1a0bd3759b0c4779fc99e9f50 SHA-256: b68f29910b5b08365adb88a7d27c974493e1168a910382f895e8b3da846bfe82
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, which is characteristic of SEO link farms designed to manipulate search results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these linked PDFs. No scripts were extracted, but the structure and heuristics point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=budismo+zen+para+principiantes+pdf PDF link annotation
    • https://wovadipe.weebly.com/uploads/1/3/4/4/134462462/zipaj.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/jbxmhdT/oklahoma_natural_gas_number_okc.pdfIn PDF document text
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/bovexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_60158fff6caf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_600d9591980ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423452/normal_5ffb310366b23.pdfIn PDF document text
    • https://cdn.sqhk.co/deloreba/EthiQLg/dress_up_games_free_download_for_pc.pdfIn PDF document text
    • https://badakawage.weebly.com/uploads/1/3/0/9/130969543/velefedaw-mixoxisixuwer-xametarilo-lemuvet.pdfIn PDF document text
    • http://baxagaxisatipa.22web.org/gefodebaxujoped.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500429/normal_5fc9ab59dff9c.pdfIn PDF document text
    • https://cdn.sqhk.co/dezuvosowato/gehd0Yb/jisuzalejubunetanawasegi.pdfIn PDF document text
    • https://cdn.sqhk.co/pelebitebi/Wvghcq8/modern_corporate_flyer_template_free_psd.pdfIn PDF document text
    • https://xedagiwaki.weebly.com/uploads/1/3/1/8/131856626/wawomifuka-gerazupofijat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_6e76dfde693b472290c36dff1f7fc36d.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_ae593665d98645c68cbb9e28c51a896e.pdf?index=trueIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_b0cf05212db04188a4bd93d4a4fa8ef1.pdf?index=trueIn PDF document text
    • http://nilidax.epizy.com/21_irrefutable_laws_of_leadership_quotes.pdfIn PDF document text
    • http://wexejof.epizy.com/bofeborobezimage.pdfIn PDF document text
    • http://jibogifimot.epizy.com/19577680192.pdfIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_4f6d32c9368643aea845f837f305a231.pdf?index=trueIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_3f692d746715477d827515a3c8c05bb3.pdf?index=trueIn PDF document text
    • http://lusetazok.rf.gd/diseos_del_proceso_de_investigacion_cualitativa_sampieri_resumen.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_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 5368 bytes
SHA-256: 0c100a209bd41fcf340b88d36b06549a72b8d2414477d955118e3a43deace568
font_01_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 11940 bytes
SHA-256: 443d89e17c786623540e8733e646ee87077659a4d9de4dd54de33b25d215c4ee