Malicious PDF — malware analysis report

Static analysis result for SHA-256 711d169251e50e42…

MALICIOUS

PDF

76.5 KB Created: 2021-03-15 09:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 58d2b4d0bf22dde17a0ee91e6eebabd7 SHA-1: 996a81ac3e4a2fd5704bdbb6b64e6383908d7163 SHA-256: 711d169251e50e42f1387665cbd5e7b626e5947fe1f6d82ead61ab6e8d4640d8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=what+food+did+god+say+not+to+eat PDF link annotation
    • https://cdn.sqhk.co/gusoguribus/gvhcEl1/28474479058.pdfIn PDF document text
    • http://nozafonavuf.iblogger.org/bejogada.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/MVLMjgE/pefonuvakujupaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/a3DThaI/noguwisemiv.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/ecGhhiH/nfl_playoff_picture_week_13.pdfIn PDF document text
    • https://cdn.sqhk.co/bimowikosaru/Vhcxjjn/mandatory_reporter_training_online_iowa.pdfIn PDF document text
    • http://zabopibisoxe.22web.org/dutim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bbfc9dc-fc86-41b9-bfbf-80031837818d/what_is_the_worlds_oldest_anthropomorphic_sculpture.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_8f28354520544cada8fd09bb2fd8ac63.pdf?index=trueIn PDF document text
    • http://zoxutudirufusoj.epizy.com/33520640846.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/5282343014.pdfIn PDF document text
    • http://feribejelabini.rf.gd/47862117880.pdfIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_d13feb17ec8f4c2fb380d990f1592d2b.pdf?index=trueIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/20894688904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f812a7c-e775-4700-a502-3d8335d166d2/76289594325.pdfIn PDF document text
    • http://fegoluvarelewum.myartsonline.com/exemple_d_un_cahier_des_charges.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/weather_report_lapeer_mi.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_51de240ef0f345e088c061b7af11f3c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fexuror/67711096145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3deff0-feda-4679-aee9-b5f55a845e51/51570118882.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/pes_2017_smoke_patch_2018.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_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 5156 bytes
SHA-256: 95a9c0a066623679af6703d70ce1a41d2b461e8b4a8c50278261493c06a1bb1e
font_01_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 11064 bytes
SHA-256: 592734d24f9c60137b1e5a3f81036913eaedacde15022a31ae040bd372b58d20

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