Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5910e69f5dfcc44…

MALICIOUS

PDF

62.3 KB Created: 2021-02-21 00:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0df190f363e421406869eaad4b6ff846 SHA-1: d0acfbbf3e6a697553627e3d53d0ae0e13e76ae2 SHA-256: a5910e69f5dfcc44f32966ea64be940561996d2dd3c132e92035a45d39db2a5f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple critical heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to redirectors or disposable hosting, suggesting a link farm or phishing lure. The presence of a link to known malicious infrastructure further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=tin+tin+restaurant+charlotte+nc In PDF document text
    • https://cdn.sqhk.co/minutakumu/iiiahhc/ben_10_omnitrix_power_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/igRnx1U/23246221825.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/pomefavur.pdfIn PDF document text
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/709ee1e306e1.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/rixogigi_zapokibikizidel_bagizotenuke.pdfIn PDF document text
    • https://vixevugipun.weebly.com/uploads/1/3/5/3/135327752/5559401.pdfIn PDF document text
    • http://wabowiwajej.iblogger.org/most_beautiful_dp.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/fjjjs0z/wyze_camera_amazon_show.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/xilojonawiwas_jobaxuwul_pezavinak.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/cWmWAij/diners_club_ecuador_solicitud_tarjeta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rupevisa.epizy.com/krishna_bhajan_hd_video_free.pdfIn PDF document text
    • http://pomezup.epizy.com/jovup.pdfIn PDF document text
    • http://davakemig.epizy.com/bupitawuturilijutot.pdfIn PDF document text
    • http://zowiseli.epizy.com/dhaka_board_result_marksheet_2018.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA43 4836 bytes
SHA-256: 5ee14883d3584c82d39a56b7e95a20703d7cb2f07d2c814258fdc6c76f673bbd
font_01_sfnt_off0000caa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 9996 bytes
SHA-256: ab7cc6a4eb5e631adc39e14fe8edcb0add886a668209fbbf8b651c479b2035c2

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