Malicious PDF — malware analysis report

Static analysis result for SHA-256 189f290d342db71f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-24 21:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f42820f047a095a960febd262c6d9de4 SHA-1: 617637f44128820c719333fccb23651018f2f87f SHA-256: 189f290d342db71f2833e97648f6048cd0ffab8b2a404acf0a4eea121ad74611
156 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. The PDF contains a large number of external links, many pointing to domains that appear to be part of a link farm or SEO scheme, such as http://xesidif.epizy.com/antivirus_avast_apk.pdf. The document body, though heavily obfuscated, contains text related to 'erosional landforms produced by sea waves' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to disguise the malicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/123?utm_term=erosional+landforms+produced+by+sea+waves
    • https://cdn-cms.f-static.net/uploads/4420020/normal_60465cd01b412.pdf
    • http://nutosuvitiraj.scienceontheweb.net/phrasal_verbs_with_get_exercises.pdf
    • http://tiwujatujoput.mygamesonline.org/51931974142.pdf
    • http://xivoxuvawet.iblogger.org/fonusuxikekufibuxogewup.pdf
    • https://cdn-cms.f-static.net/uploads/4456699/normal_602c6681d6b76.pdf
    • https://cdn-cms.f-static.net/uploads/4369516/normal_600cedb4d958c.pdf
    • https://static.s123-cdn-static.com/uploads/4376101/normal_6004e8ea1e7cc.pdf
    • http://zumufufup.sportsontheweb.net/17830571855.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xesidif.epizy.com/antivirus_avast_apk.pdf
    • https://uploads.strikinglycdn.com/files/06d41852-39bb-4ce3-98b3-571926649b03/jidenutopijurixo.pdf
    • http://xemubekimivimed.epizy.com/ancient_greek_culture.pdf
    • http://pogetowem.onlinewebshop.net/78070192048.pdf
    • https://uploads.strikinglycdn.com/files/b0bea7f0-7bfb-4897-b69c-0873148db65d/articulo_117_y_118_de_la_constitucion_mexicana.pdf
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_351a9a3abc294c10b27d423718e5bfd2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/193102ff-5609-4046-b7a2-265e6c691659/al_quran_mp3_download.pdf
    • https://uploads.strikinglycdn.com/files/27b1a470-123d-4ca3-a926-63dbb2a7245a/10686922040.pdf
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_db6a1c63c6e14e31836087da7f9ce634.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f4bd538a-aa74-40f0-9d10-49244a9ab610/33057141325.pdf
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_b29f9eb193c348d28e1530bdffbb3d24.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37382f5f-621c-4e48-a385-c04daf12d285/20060134710.pdf
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_d72ef75e8f114e36956ecce3a024e0b0.pdf?index=true
    • http://gebuvuvoxu.rf.gd/27917850272.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfb.bin
409017919bfc994ffb98dec2f3680ef62fbd9bcc5bf2ba8dffbb111b2a59d65c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 5652 bytes
font_01_sfnt_off00010136.bin
fde04431c3e35964f854fb2e31d91d09ffd4e7b127fb96d28f927fcef8ccb68f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 10136 bytes

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