Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7786a3a02c480a…

MALICIOUS

PDF

75.8 KB Created: 2021-06-09 05:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3a59c1ae2fb21d144df8bf358bacf237 SHA-1: 3255c590ebfcb3c507f8e0837e5981f9fa98a473 SHA-256: 9c7786a3a02c480a20059d29c071f7c8cf0172283895e65c14ac9a4528771c7f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external PDF links, many hosted on disposable domains, suggesting a phishing or spam campaign. The primary URL, https://maypoin.ru/123?utm_term=visio+cause+and+effect+diagram+template, is presented as a template, likely a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://maypoin.ru/123?utm_term=visio+cause+and+effect+diagram+template PDF link annotation
    • https://kizatoruzosij.weebly.com/uploads/1/3/0/9/130969146/76e807c1f778.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/xenuzikupuse-nudolibojuwamod-guburi-dujodasegefigo.pdfIn PDF document text
    • https://jerolukemotib.weebly.com/uploads/1/3/0/8/130874115/369432daa8484.pdfIn PDF document text
    • https://bukekumagisalej.weebly.com/uploads/1/3/5/3/135333054/sexovoza_tafuxufufi_ladomotipana.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/foxatuta.pdfIn PDF document text
    • https://vukegodepobaxi.weebly.com/uploads/1/3/4/6/134676750/juwuwanewimuvome.pdfIn PDF document text
    • https://sikalejewop.weebly.com/uploads/1/3/5/3/135341852/e818951162c2.pdfIn PDF document text
    • https://doxujivadew.weebly.com/uploads/1/3/4/8/134875716/xunanonenikiwikix.pdfIn PDF document text
    • https://fiduwovizeget.weebly.com/uploads/1/3/4/5/134517619/8313846.pdfIn PDF document text
    • https://zukifetev.weebly.com/uploads/1/3/4/7/134725253/xowav_wirasawumuv_besagutozevo_nabibud.pdfIn PDF document text
    • https://jejedutetobi.weebly.com/uploads/1/3/4/6/134662716/80f9ae1d6266a.pdfIn PDF document text
    • https://gufofusubovara.weebly.com/uploads/1/3/5/3/135323195/jevepekebame-setunabe.pdfIn PDF document text
    • https://jasadugo.weebly.com/uploads/1/3/5/3/135341750/5f4ca58d2aca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kigemulu.pbworks.com/f/life_science_grade_12_past_papers_and_memos_2019.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144454401/how_to_read_multimeter_ohms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b2d13b-7732-4cf4-9f48-69305d5e82f2/annie_dillard_total_eclipse_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/459e3f85-f0f2-41d3-b104-46b6ad2aea8d/greatest_salesman_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8159ddc9-9890-44e1-8f5e-5300fabb11cf/everydrop_whirlpool_water_filter_edr1rxd1.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_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 5440 bytes
SHA-256: 21c98a7872cb2133e924734e279a3f742ddb9b9a62bf609a9bd0fd3e457ad8e9
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 9700 bytes
SHA-256: 75fb94ae9f90547abb97d8a77beee3e71a05754737fd85669e41c86a0f8db7c6