Malicious PDF — malware analysis report

Static analysis result for SHA-256 0096c137da2ff742…

MALICIOUS

PDF

74.0 KB Created: 2021-02-21 03:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b031f344d62531886866871ec4ef8ef3 SHA-1: 5976a99fbad1defe0efccd8a47f75e4acf109e58 SHA-256: 0096c137da2ff7423974e1f44d791bcb68e0f65fcef3d9f1ef552c5f607c3b06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URIs, with a primary external URI pointing to 'jottigo.ru', suggesting a lure to a malicious site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed as a link farm on disposable hosting. No scripts were extracted, but the overall structure and heuristics point to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/wix?keyword=cuantitativa+y+cualitativamente PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496381/normal_5fd6f04a3feb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_601b74f7cddb0.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/jdZP1jd/ballsy_guy_definition.pdfIn PDF document text
    • https://sijujufe.weebly.com/uploads/1/3/4/6/134696532/kugakiboxis.pdfIn PDF document text
    • http://dukofinezamidol.22web.org/hungry_dragon_apk_latest.pdfIn PDF document text
    • https://xanuzelikaba.weebly.com/uploads/1/3/4/8/134889809/ceae0f34188863d.pdfIn PDF document text
    • https://nufujemirifo.weebly.com/uploads/1/3/4/8/134868255/titik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465703/normal_5fdd9a975ef36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_6026dcb2e665f.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/hhiauZ0/salesforce_report_drill_down_button.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fc955b11176e.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/rumezo/jeponaxuxejizagepifor.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/kimibe.pdfIn PDF document text
    • http://ludujefu.epizy.com/ferabenugeriba.pdfIn PDF document text
    • http://miwafugupek.epizy.com/rugawilobabelolo.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/golden_arrow_vector_free.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_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 4736 bytes
SHA-256: b28943af87f335a56614c914fa33f89278de560ac832576cfb8ed6b4eb633d92
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 11788 bytes
SHA-256: c834fa85dae0d1bab2843c5c1189917972513c9f8403685358b2dc02f1e77baf

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