Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88906b4c7adce67…

MALICIOUS

PDF

76.3 KB Created: 2021-03-10 07:37:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fc6da0afd50fdf958029c5a9c8a7e4b7 SHA-1: 300d0afaec07391ede76d04f62d3d0279996812e SHA-256: e88906b4c7adce677e0dc419021f9239a7ae9e9ac49e7803284c21b2c8add031
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dugedepap.ru/wix?keyword=gateway+regional+property+services PDF link annotation
    • https://cdn.sqhk.co/sivadapexiri/3gcs6jf/kohler_toilet_water_running_slow.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/jijaWje/sri_lankan_chinese_vegetable_chop_suey_recipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_603ce7a5e35cf.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/25882963331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496148/normal_5ff781c4cefa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_6019d78a69650.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382405/normal_5fca1a538fa47.pdfIn PDF document text
    • https://cdn.sqhk.co/tinajugezepi/YjhUvqi/final_fantasy_xiv_shadowbringers_ps4.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/jafidexuninimejevogemirit.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/84147665061.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/agjQijR/insolvency_act_kenya_law_reports.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/iagejbQ/zoxosisojirojereb.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/dFifjhB/brahma_chicken_price.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/lghiGl8/vewezax.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/who_were_the_first_christian_martyrs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_d55a77a33f104d7bbcf177aaea4b6fcd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wajibile/boost_synonym_informal.pdfIn PDF document text
    • https://eda93683-a6ca-45e9-8056-ca7adea7f1dc.filesusr.com/ugd/d655db_98f539d4a5984f4ab7dc43ecd4fb3589.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/ps_vita_emulator_apk_pro.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_6dabfd9e9df248a6bffb5cc5a0bd11f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/email_templates_asking_for_donations.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/15th_finance_commission_report_date.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_952406384cd4439b8bcae444b4290d6e.pdf?index=trueIn 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_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 5388 bytes
SHA-256: b0752d5927f4591feef0387aab6ede3b46d46acd6212f87161f00d7be430bfce
font_01_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 10612 bytes
SHA-256: f673af3933defa36e917495cb0d4f3a1a68c4c5964ef25b1e8f3a7c5af63e5b9