Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f911ad2eedd31d…

MALICIOUS

PDF

65.8 KB Created: 2021-02-19 13:50:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b2f1440b7810ad668a0fcb5f82ae7b83 SHA-1: 634dbc841d6b4f838ba5bd63ee185e639b6d9677 SHA-256: 53f911ad2eedd31d70335a196a3150f554a32cdb511336116203a4653d33a787
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many pointing to disposable domains and potentially malicious redirectors, suggesting a phishing or SEO spam campaign. The presence of a link to a redirector infrastructure further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/aws?utm_term=snapper+mower+blades+near+me In PDF document text
    • https://zepudelewow.weebly.com/uploads/1/3/2/6/132682561/babefo.pdfIn PDF document text
    • https://cdn.sqhk.co/xikesurufa/crgjhdc/alivio_definition_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/jomawutid/1heiejf/dotelafifofugemuxopif.pdfIn PDF document text
    • https://kajabukege.weebly.com/uploads/1/3/1/3/131379037/desexidigiwovu.pdfIn PDF document text
    • https://pejudipevunasu.weebly.com/uploads/1/3/5/3/135351173/dbca04.pdfIn PDF document text
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/zasulupopizilupezeki.pdfIn PDF document text
    • https://wederubumojap.weebly.com/uploads/1/3/5/3/135393822/sufubedozofuzoz.pdfIn PDF document text
    • https://zatiwakap.weebly.com/uploads/1/3/1/8/131871625/tanavadapanafex.pdfIn PDF document text
    • https://nasabera.weebly.com/uploads/1/3/4/4/134447265/3849429.pdfIn PDF document text
    • https://segoluremu.weebly.com/uploads/1/3/2/7/132740478/mekivabimel_dopomopita_mukaberipoga_fajizawibepevo.pdfIn PDF document text
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/4a1dfe9a75.pdfIn PDF document text
    • https://vigajinid.weebly.com/uploads/1/3/4/8/134889024/8286583.pdfIn PDF document text
    • https://pavadugubuwab.weebly.com/uploads/1/3/4/3/134309483/megulufusi_vepase_zomavejagupu.pdfIn PDF document text
    • https://lidugozomamaxo.weebly.com/uploads/1/3/1/6/131606349/tiwuj-bokalazom-bives.pdfIn PDF document text
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/lowapuvadava_dijazagime_fabinufexu_nabewunegifozeb.pdfIn PDF document text
    • https://vazexisosumufil.weebly.com/uploads/1/3/4/4/134465451/lexifiluboxoz.pdfIn PDF document text
    • https://fusorebumobem.weebly.com/uploads/1/3/3/9/133986296/bf819ffa01e80.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/icxhfiv/fimobesosilovunukujej.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/b9a79d611b2a927.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kasojazosejona.epizy.com/4756450878.pdfIn PDF document text
    • http://roragopijejem.epizy.com/homer_the_odyssey_summary_in_hindi.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_off0000c52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52B 5440 bytes
SHA-256: bfdf300895f64ece574cffa68f0a1079ff6ce247f44c4d642b9f0c096d8f3678
font_01_sfnt_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 10080 bytes
SHA-256: 9de5749bf4e3e02b41dc36741db9b79aca9a6472683ed6393a72fc477e0accca