Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cc5b40ee6283f4…

MALICIOUS

PDF

75.4 KB Created: 2021-03-31 21:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7be44954a0c6db384e978258426cf88d SHA-1: 11f7b43fb0e5fa62534bc52c93036a8963f64589 SHA-256: c9cc5b40ee6283f46ff2772ae6a3770e6b4e3370ba95c9a727da2eb7076abe3b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or content-luring attack.

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
  • 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.
  • 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://jacksth.ru/strik?utm_term=why+are+lab+reports+important PDF link annotation
    • https://pedesidava.weebly.com/uploads/1/3/4/3/134355179/b5f60fe9074221a.pdfIn PDF document text
    • https://wuwebiwurumebil.weebly.com/uploads/1/3/1/1/131164488/186200.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/yTGjdhh/livamofejozu.pdfIn PDF document text
    • http://kovemiwixipogaf.66ghz.com/what_is_the_setting_of_junie_b_jones_and_the_stupid_smelly_bus.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/qTifEia/lullabies_for_babies_to_sleep_disney.pdfIn PDF document text
    • https://tilavulam.weebly.com/uploads/1/3/0/7/130739056/e73d0eb.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/8686797.pdfIn PDF document text
    • http://fikepoj.22web.org/51434092568.pdfIn PDF document text
    • https://xipumizi.weebly.com/uploads/1/3/4/7/134746986/javuji_nonen_zegapab.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/icN6bha/97318539016.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jewugafi.rf.gd/definition_of_belief.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_31a77d95f37047509c359a461a3b3b5c.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_5a392ed054954fe293bf8d11228c8f24.pdf?index=trueIn PDF document text
    • http://magunimoxuviw.epizy.com/dr_jamal_badawi_books.pdfIn PDF document text
    • http://vavubal.epizy.com/61066800731.pdfIn PDF document text
    • http://vomepixoj.rf.gd/agri_coaching_chandigarh_download.pdfIn PDF document text
    • http://rajixubododafu.epizy.com/muraz.pdfIn PDF document text
    • http://zotapem.rf.gd/private_instagram_videos_on_computer.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_off0000e775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 5312 bytes
SHA-256: 0d64bdfffec698e5d04be55fa57301fdf7edd3632eca7e97070accc31196fee2
font_01_sfnt_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 11756 bytes
SHA-256: 704698c59f0588cddef62680f311164647e1b21c440ed725e706b0f7d88d6f45

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