Malicious PDF — malware analysis report

Static analysis result for SHA-256 d650cba8349cf5f6…

MALICIOUS

PDF

71.9 KB Created: 2021-02-24 14:13:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 31bf7fd0e52206a9373d54e486e587ec SHA-1: 27f69cbc68b800bceb3bfe4999eac214843d374f SHA-256: d650cba8349cf5f6ea7b5134114911d0287419e4b9d50bf7cfbd9bc41ad10068
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics indicating it functions as a malicious redirector. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated, but the presence of links and the overall structure suggest an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/wix?keyword=george+washington+charter+elementary+school+palm+desert In PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/roluvut_figoja.pdfIn PDF document text
    • http://vostokzapad.su/genogaxokapajebot0mmpj.pdfIn PDF document text
    • https://xifupanudolegu.weebly.com/uploads/1/3/1/1/131164204/namisuw.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/jeUidja/talivobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_601808d87cb5d.pdfIn PDF document text
    • http://axacheat4.xyz/84722260764e26o9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380681/normal_5fcf0f09850a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fcefb4b842ca.pdfIn PDF document text
    • https://navolujute.weebly.com/uploads/1/3/1/4/131483334/rewiporalekabatijox.pdfIn PDF document text
    • http://fullhp.info/75386975863b9ws0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_6028a21ce753d.pdfIn PDF document text
    • http://rubka.space/73709395538x7vry.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/vQShcaO/magufotoko.pdfIn PDF document text
    • http://indir-kazan.com/dopagopem4c9o.pdfIn PDF document text
    • http://qunit.space/wafiruzegibudovemudemose0tsan.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/WiWjeDD/robot_helicopter_mod_apk_download.pdfIn PDF document text
    • https://zavowajasobi.weebly.com/uploads/1/3/1/4/131406950/280f247683.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dejamatokato.rf.gd/algebra_questions_and_answers_year_11.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 5500 bytes
SHA-256: 4367376f523c2de38f9fbaffb0573484592a9f11ba9440a9b2b46f011b1812bf
font_01_sfnt_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 10348 bytes
SHA-256: 0e2c5568c7a6b8416e831ffd903a3d0b31a8fe3c8b33d9d5f07ff33e7501348c
font_02_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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