Malicious PDF — malware analysis report

Static analysis result for SHA-256 c188740f4f2a5059…

MALICIOUS

PDF

76.7 KB Created: 2021-03-14 22:18:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dedaebc7d49b4931f977d650ad3e1f88 SHA-1: d7fe4e2f2acaacc6dcea91ffd8ebb33d6136e858 SHA-256: c188740f4f2a50595585f8241dba4b156e1d04d1f07be0f9fee57f91ce64d540
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users to potentially malicious content. The primary lure is a seemingly innocuous topic, 'How to snapshot on iPhone 6 plus', which is used to mask the malicious intent of directing users to URLs like https://midufefew.ru/strik?utm_term=how+to+snapshot+on+iphone+6+plus.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://midufefew.ru/strik?utm_term=how+to+snapshot+on+iphone+6+plus PDF link annotation
    • http://verezitabel.66ghz.com/cafe_formaggio_delivery.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/hWNSNoo/velubisasawux.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/cihhche/penifaverewijodurapavadod.pdfIn PDF document text
    • https://cdn.sqhk.co/jalegewiguw/ODggR2n/vokepokududoni.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/j5Nggz0/your_life_simulator_mod_apk.pdfIn PDF document text
    • http://somamorizeti.iblogger.org/xuradapus.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/6Pidjj2/overkill_synonym_idiom.pdfIn PDF document text
    • http://mepanawabopod.22web.org/nasdaq_bx_port_request_form.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/bejenosugede/nordictrack_cx_938_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/artery_of_percheron_stroke_case_report.pdfIn PDF document text
    • http://divupalol.epizy.com/corolla_verso_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/33441616038.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_17ee2b87de4042b595daa331791ec8a6.pdf?index=trueIn PDF document text
    • http://vobumubuto.rf.gd/zimorirotitawizezanil.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/84641467414.pdfIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_2956681de9d848f180f5e238ff6aac8a.pdf?index=trueIn PDF document text
    • https://b993c520-4fc9-488d-8dda-35d8b3dc2713.filesusr.com/ugd/6f5492_3eb0e1944a8847afadf1208eee508c25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/candy_crush_soda_pc_game_free.pdfIn PDF document text
    • http://fejusadifidexi.epizy.com/bebakodusikejobutu.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_61352a05138845a9a64c58bf0401a64d.pdf?index=trueIn PDF document text
    • http://nofegogimulat.rf.gd/19508239046.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_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 5016 bytes
SHA-256: f1490b320847ca426da0ac37f34425184ee6b2302c831711e7231dbea90efd11
font_01_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 12252 bytes
SHA-256: b30365786a4396890cd9e23ffd88d4f7fdba61f6563df838c79a06807c23c94d

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