Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ccf726f0f9927b5…

MALICIOUS

PDF

73.3 KB Created: 2021-02-08 06:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 812959085e6d876d4fcff73e68a9f679 SHA-1: e842f6b150ff504b246114f57aef65064763369f SHA-256: 4ccf726f0f9927b5682013219663d0c03e4b9eecf37cc6b8c1a6190ceef67b44
222 Risk Score

Malware Insights

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

This PDF document contains a critical heuristic firing for linking to known malicious redirector infrastructure, disguised as a 'church membership transfer letter template'. It also exhibits characteristics of a PDF link farm, containing numerous external links. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as Pdf.Phishing.Trojan. While no scripts were extracted, the presence of malicious links and the overall structure suggest the document is designed to lead the user to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://crophysi.ru/wb?keyword=church%20membership%20transfer%20letter%20template In PDF document text
    • https://cdn.sqhk.co/netesatova/yjedgdD/37722662594.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/cifihHq/24452061152.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/g1ihzzv/drawing_light_board_neon_glow.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/bWmibia/zikidipifamatumiru.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/eZrTI9r/gisirixelevum.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/gdx5bnL/classdojo_for_parents.pdfIn PDF document text
    • https://wumaluruporemad.weebly.com/uploads/1/3/0/9/130969386/4427070.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/0FjjijG/933590319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488314/normal_5ff280e53e5da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5fe9f4ea23509.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477162/normal_600290791476c.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/chdehea/24012097569.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/KIPXdgd/crazy_dog_lady_shopping_bag.pdfIn PDF document text
    • http://ideal-it.fun/fallout_4_settlement_guide_survivaltvkxt.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/ghicjih/desert_battleground_apk_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/dudilirugido/cEgdaig/fly_gps_pro_with_joystick_mod_apk.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/zojifekejet-joxorixesawofu.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_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 5300 bytes
SHA-256: 6f9d4120a22b094f4176e6a8f507d3c80665ee4270057988ddb51c3e390efa42
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 10532 bytes
SHA-256: df55a2e816ca9df248dbea8f27865a8d42c13cc4b71705cd42b07126563fec54

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