Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b18f61d51ace4ab…

MALICIOUS

PDF

79.0 KB Created: 2021-06-05 18:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1955555ffbc8de18869c9e15c2f81224 SHA-1: 5c4870f2e5203180b45f75ee3d86a8716caf3db0 SHA-256: 9b18f61d51ace4ab943294fbeaa062cff6211b081505f35d65fd95fd08bd6c81
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links, likely for phishing or malware distribution. The presence of embedded URLs, including one pointing to 'synerhu.ru', further supports the malicious intent of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://synerhu.ru/pbw?utm_term=avocent+acs6000+firmware PDF link annotation
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/917fbb4ffa34a47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_6028281f9da36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_604e7c07a9251.pdfIn PDF document text
    • https://tizetenu.weebly.com/uploads/1/3/3/9/133999913/7c56525cda.pdfIn PDF document text
    • https://luzusuzure.weebly.com/uploads/1/3/0/7/130775685/2f2cf0da41c765.pdfIn PDF document text
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/3308117.pdfIn PDF document text
    • https://girusetobar.weebly.com/uploads/1/3/1/0/131071114/328187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_606a494bb24d9.pdfIn PDF document text
    • https://jerepukiw.weebly.com/uploads/1/3/2/6/132681878/4065774.pdfIn PDF document text
    • https://zitofizifejiza.weebly.com/uploads/1/3/4/7/134706741/nenatixedalod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465935/normal_60035b33cd4ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://letonepamusi.pbworks.com/f/how_do_i_pay_my_t_mobile_bill_over_the_phone.pdfIn PDF document text
    • http://nipekari.pbworks.com/w/file/fetch/144603528/dakilazuvosizajegojusunen.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/f/chemistry_matters_2nd_edition_textbook_answers.pdfIn PDF document text
    • http://jopamedet.pbworks.com/f/54759632038.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144424836/67782422393.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/kelabulopunigaroxovizilo.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/f/does_bigger_leaner_stronger_work.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/f/pajerumonufevenamukizu.pdfIn PDF document text
    • http://zufumegi.pbworks.com/w/file/fetch/144411495/how_to_play_beat_saber_cheap.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144510069/29686559962.pdfIn PDF document text
    • http://nugewil.pbworks.com/w/file/fetch/144607131/krups_pixie_coffee_machine_instructions.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_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 3712 bytes
SHA-256: 8de5ade3925e18bad585975bb2560eebcbe266f0d18e6c6d031ada4ab4ba7a48
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 5432 bytes
SHA-256: dac3bb1b462799c4fddd57feaa99a26d876af6fb4dca28dbd992e6ad7e06a58a
font_02_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 11976 bytes
SHA-256: 1be0ee5c04dbb9140d340d68d2e6ae35dbd8f27bffde90b3f708e5dd776eecd5