Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e1cab7a4804e24…

MALICIOUS

PDF

67.6 KB Created: 2021-01-10 10:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a92a82021667b02bb055d087081ec0a5 SHA-1: 9e28eb7606419fb66ed73f9f229f752fded73408 SHA-256: d6e1cab7a4804e24583d35d4b819140bc429ad554a3206c307d1d322e35d6b0a
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to known malicious infrastructure and a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The presence of a visual download button and the embedded URLs suggest a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/aws?utm_term=atualizar+android+tv+philco In PDF document text
    • https://site-1175991.mozfiles.com/files/1175991/2742936762.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444853/normal_5fe3aec3d3c2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496404/normal_5fcad4fb4b76f.pdfIn PDF document text
    • https://site-1178275.mozfiles.com/files/1178275/spotify_playlist_converter_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_5f9bb9ff1cf03.pdfIn PDF document text
    • https://site-1166616.mozfiles.com/files/1166616/afcent_reporting_instructions_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416332/normal_5fb974b80ecfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5f963bfebe4d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385876/normal_5fdb28f43d43c.pdfIn PDF document text
    • https://site-1172039.mozfiles.com/files/1172039/sisuwutababojewerejas.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/55c06bce1a8190f.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/jd7Dhj6/54120991536.pdfIn PDF document text
    • https://site-1173983.mozfiles.com/files/1173983/ice_cream_recipe_without_eggs_condensed_milk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405419/normal_5f9fa605a18ca.pdfIn PDF document text
    • https://vivesajepud.weebly.com/uploads/1/3/0/9/130969004/b913aaa86b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AC 5080 bytes
SHA-256: e2ffa7c01902a1c384afca43b8d0e1f786dd810ba72c7ce7397fc2812bc09243
font_01_sfnt_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 11068 bytes
SHA-256: 8ff5db909258e1b06fe910d05d476f67455b8876268540e9358cb622c41be17b

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