Malicious PDF — malware analysis report

Static analysis result for SHA-256 87380b1710fd694b…

MALICIOUS

PDF

78.1 KB Created: 2021-02-11 14:02:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: aaf2e8f9ce97ab149287878d6b94164d SHA-1: 97dfe9a44ea99911582bf262a36b8bbbb5baa20c SHA-256: 87380b1710fd694b474929c63eb24f0b09b07f8216c0685ceb2f9f6add4c55a5
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a phishing or malware distribution site, likely delivered as a spearphishing attachment.

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
  • 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 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.
  • 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://crophysi.ru/123?utm_term=bleach+gotei+13+invading+army In PDF document text
    • https://rikedinodewo.weebly.com/uploads/1/3/5/3/135323941/napukudebufalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_601a59af288a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411682/normal_5ff54ac7453c5.pdfIn PDF document text
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/8556de80d.pdfIn PDF document text
    • http://kosodidaxelo.22web.org/chlorination_report_meaning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5fc7f2b6b8c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_600e682c31a16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465930/normal_601f739670b02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421214/normal_5ff909c556b57.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/pipaneku/apartment_30_day_notice_letter_template.pdfIn PDF document text
    • http://mijuguxugatuk.epizy.com/best_free_phone_recording_app_for_android.pdfIn PDF document text
    • http://puwekaxaxowiza.epizy.com/3d_surround_sound_video_player_apk.pdfIn PDF document text
    • http://dakiwadizadenig.rf.gd/avira_antivirus_cracked_apk.pdfIn PDF document text
    • http://pimizebogo.rf.gd/deptford_nj_police_reports.pdfIn PDF document text
    • http://gabatotudam.rf.gd/13217119652.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_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 4508 bytes
SHA-256: e1b19d515a3b6a30a346a613bfccc337b57e68c9953c946ab40c207f2bcd074c
font_01_sfnt_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 5604 bytes
SHA-256: 50ef8e4adaf4303b8edb9edcc9266e63c11ee34d31b929aeb3d35b3ebe05e031
font_02_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 10360 bytes
SHA-256: 7050bcfae752fb824a7123da81e997204ee900f91beb9348447e6895c6baa406

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