Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6fb7b917eceeac…

MALICIOUS

PDF

77.3 KB Created: 2021-01-29 02:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4124f4fcf1a9dfec89cdd979cdb42b8d SHA-1: 1647f1c95f95a699a287c66c635b2155af4451b3 SHA-256: 6c6fb7b917eceeac1f403372114f0016c93d1e6badcf60b7f1a3502d910a60e2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('maypoin.ru') that is flagged as external. Heuristics indicate the PDF is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=cartel+delos+sapos+2+personajes+originales PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467910/normal_5ff214f524a4c.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/csuggiB/rukoroperuk.pdfIn PDF document text
    • http://zomoxesami.22web.org/webiziwafularavipa.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/iRgewid/juwifesoj.pdfIn PDF document text
    • http://myfavoritesun.xyz/48157874237v5yy4.pdfIn PDF document text
    • http://lavka-karamel.ru/rusafukegevajamibivux51ww.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/hhYSmoF/fotiveworupabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fce9661c77a8.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/cMhb2gi/wozafolu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nedilopasosugop.epizy.com/perez_reverte_la_reina_del_sur.pdfIn PDF document text
    • http://gadoxijumulop.epizy.com/hyperkalemia_management_guidelines_uk.pdfIn PDF document text
    • http://sewexojin.rf.gd/crystal_report_for_visual_studio_2013_runtime.pdfIn PDF document text
    • http://peworesafasar.epizy.com/litaxeloturuguzon.pdfIn PDF document text
    • http://wuduzukatej.epizy.com/60553063218.pdfIn PDF document text
    • http://jiwimid.epizy.com/rpg_maker_xp_cracked.pdfIn PDF document text
    • http://sofidusujewa.epizy.com/mcafee_antivirus_plus_with_key.pdfIn PDF document text
    • http://zivuneko.epizy.com/wumegetev.pdfIn PDF document text
    • http://madanekobovuge.epizy.com/11030725645.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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 5144 bytes
SHA-256: 1057316722f76b1bc2fb11c6b0add4fe7633c166f8211a084cc92bedb8cad01d
font_01_sfnt_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 13576 bytes
SHA-256: 43a1f33d4a11e35e02830f0d72b65abeeb1f19d62c25be3ef015c6adfbb0fdd2
font_02_sfnt_off0001176f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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