Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8ef2f8ee1f2aed…

MALICIOUS

PDF

75.5 KB Created: 2021-04-22 20:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c77dcf3ce008e5c41759239392a66277 SHA-1: 202086aa54a2e5e98ab6708ad58eae49e7d34750 SHA-256: 1c8ef2f8ee1f2aed8e09db6f862138eff01efbf42ef8fa362aea6ed7e2a6decf
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF files, suggesting a link farm or phishing lure. The primary redirector URL, 'https://baarspo.ru/strik?utm_term=what+does+the+name+historia+mean', is heavily associated with phishing and malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, reinforcing the phishing and potential malware delivery intent.

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.
  • 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://baarspo.ru/strik?utm_term=what+does+the+name+historia+mean PDF link annotation
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/8623191.pdfIn PDF document text
    • http://daating19.site/kebulafebojititii66.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/guide_for_pes_2017_pc_free_downloaddtzpw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_60591d2a07d6b.pdfIn PDF document text
    • http://shortsomfj.space/how_to_use_a_brinkmann_smoke_n_grillfc9j7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_602ee5090075a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490524/normal_602edde9174fb.pdfIn PDF document text
    • https://wamonudikiso.weebly.com/uploads/1/3/0/7/130776885/zikaxawo-nolorofizadixut-junisiwijuj-runozawig.pdfIn PDF document text
    • http://reduslim-europa.site/xobovoremulozivaxv6ba1.pdfIn PDF document text
    • http://storeplus.pro/how_many_different_nitrogenous_bases_are_there_in_a_molecule_of_dnaik514.pdfIn PDF document text
    • https://rojobasexadef.weebly.com/uploads/1/3/2/7/132711954/xajun.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/kegubinefuda/ninowokagilomevimavokaj.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/careers_in_graphic_design_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/negakedofatenemimifiz.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/midisodenulakexunimugem.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/intercessory_prayer_bible_text.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/54322145564.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/west_elm_linen_sheets_care.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_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 5048 bytes
SHA-256: 990050bcd9ec8398a8ad7d83715639f7ca39ae1dada57149c7d517a7fae7570c
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 11904 bytes
SHA-256: 4b10a02e148da61d2ba00a4a89fcafb1ccdb1527370a3a78d2350859f74add29

Open this report in the interactive analyzer, or submit your own file for analysis.