Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dca8730f720bf0…

MALICIOUS

PDF

78.8 KB Created: 2021-01-06 12:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 429a1a5f982d98f2bfbca690862e3b63 SHA-1: 3d63504a3bf693ff4a12c189aafb037f2e556382 SHA-256: 18dca8730f720bf0c0582715e00228917ab850273e1f1b16f18641c09b63be4a
214 Risk Score

Malware Insights

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

The sample was identified as malicious by multiple heuristics, including critical alerts for linking to known malicious redirectors and hosting a PDF link farm. The embedded URLs, such as 'https://traffine.ru/aws?utm_term=meningoencephalitis+review+pdf', suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly indicate malicious intent, likely involving the redirection of users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/aws?utm_term=meningoencephalitis+review+pdf In PDF document text
    • https://cdn.sqhk.co/kagelemovo/iflkOjj/plants_vs_zombies_2_online_no_download.pdfIn PDF document text
    • https://mogawurid.weebly.com/uploads/1/3/4/0/134042680/puxepif-lafuzav-gamug-duwez.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/97878.pdfIn PDF document text
    • https://migomazi.weebly.com/uploads/1/3/1/4/131407029/3514480.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/benuka/mivijomezigosapew.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/joovy_caboose_ultralight_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/sorry_fire_and_ice_instructions_to_print.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/wofigipoladusodebava.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/horner-wadsworth-emmons_olefination_reaction.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/accretion_dilution_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/79598093462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d683da2-2cdb-43ca-b34f-078bc0979e3a/asakusa_culture_tourist_information_center_tokyo.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/calculus_volume_2_narayanan.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_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 5576 bytes
SHA-256: 01357af9a8f7c4922143172c9e873b9aed3c951abab625800f097aba81d8bc49
font_01_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 12176 bytes
SHA-256: 84d89b77a20b9b84a035e19621c537624e1f3e5cc86aaa6d48d79b0ef7851f12

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