Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cff9f4381724ed…

MALICIOUS

PDF

59.5 KB Created: 2020-12-14 13:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 700838007af648274d6364ebf317123f SHA-1: 77c09bc26000752c53ebca2eef47159fae02b3f4 SHA-256: b2cff9f4381724edebe86992ef2cb63e3bb3d93d93f9f9f0fee7a5950bd51298
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to an 'answer key'. The presence of a malicious redirector link and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://traffmen.ru/123?utm_term=direct+and+inverse+variation+worksheet+answer+key In PDF document text
    • https://kidogotetivi.weebly.com/uploads/1/3/4/3/134375399/nofivi_wojomelul_sekafivegi.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/b491246f513350d.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/3969400.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/lesob-dunebegori-texas-bekifute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451230/normal_5fcf07c280302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_5f9893edc958c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_5fa147e38270c.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/3414892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f91f26f89f4d.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/muxozuvalubi/boarding_card_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5659f6609fd0ee7af9d99/t/5fc71f4b0791337046de2365/1606885196197/descargar_apk_story_saver_for_whatsapp.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a3195e8e827d4299026a/t/5fcb24a6551bdc47e7a3c68e/1607148711241/muxiveradesowenapixug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389340ec-1ed2-4271-acbd-e0df41025627/girl_scout_border_clip_art_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_off0000add2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD2 5312 bytes
SHA-256: 203511a16abc5d0e9239e5b8dcc256af8495add053d39a6bb54982f929ba3145
font_01_sfnt_off0000bffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFC 9720 bytes
SHA-256: 2b8efda091823fc875da835bceb76b25d561e3c7975c0aba6cd05687dc5baaef

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