Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae770f51a48e2e0…

MALICIOUS

PDF

71.2 KB Created: 2021-01-13 11:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b2d295c5e26cdd940d1d0bd2396199fe SHA-1: 77c138b8a43a7a9698658a7db957c74c1c3ee93b SHA-256: 7ae770f51a48e2e032f7f59a1ef5921aee95a9da4696d864fa15a285fe31222a
224 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, including a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though partially obfuscated, contains text related to 'Windows defender notification icon process', suggesting a social engineering lure. The SE_CLICKFIX heuristic indicates the document likely instructs users to execute commands, a common tactic for downloading and executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://traffine.ru/123?utm_term=windows+defender+notification+icon+process In PDF document text
    • https://site-1180361.mozfiles.com/files/1180361/hunter_x_core_manual_operation.pdfIn PDF document text
    • https://site-1168194.mozfiles.com/files/1168194/tiled_map_editor_collision_layer.pdfIn PDF document text
    • https://site-1166717.mozfiles.com/files/1166717/vamur.pdfIn PDF document text
    • https://site-1173140.mozfiles.com/files/1173140/repulsed_synonyms_word.pdfIn PDF document text
    • https://site-1176298.mozfiles.com/files/1176298/crafting_and_building_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426819/normal_5ffcaa72333d2.pdfIn PDF document text
    • https://site-1172822.mozfiles.com/files/1172822/52477256273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373770/normal_5fc186c872770.pdfIn PDF document text
    • https://site-1218567.mozfiles.com/files/1218567/zopododuv.pdfIn PDF document text
    • https://site-1171867.mozfiles.com/files/1171867/rariseto.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/lanubili/calendar_excel_2016_template.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/cultivo_de_arveja_plagas_y_enfermedades.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_off0000db65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 5224 bytes
SHA-256: b0ce04955e4f605280e07a09d9dda1f2360d2233869e5a62188b77a87db3707a
font_01_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 10156 bytes
SHA-256: ff4c4b4fae4cf1db5a63c72d0bf2090e022ca351a0a4b4ebda8083580fc65d6a

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