Malicious PDF — malware analysis report

Static analysis result for SHA-256 827135dc1a9697bf…

MALICIOUS

PDF

85.0 KB Created: 2021-02-05 16:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 95ada3ffada3dce94e308cdcada1b2f6 SHA-1: 4887c5cf5ef41965b5ad3100774d11e06785a6bf SHA-256: 827135dc1a9697bfb11590971c7742806d3a99469629b47267f519bd1795231b
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains multiple heuristics indicating malicious redirection and phishing attempts, including links to known malicious redirectors. The document body, though heavily obfuscated, appears to be a lure related to 'Athena early build borderlands', likely intended to trick users into downloading a payload or visiting a phishing site. The presence of ClamAV detection and ML flagging further supports its malicious nature.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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/123?utm_term=athena+early+build+borderlands In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_601508dc8b834.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486197/normal_5fcab91de1984.pdfIn PDF document text
    • http://fruit-ital.space/nojazipasunurawatodurivenq72r.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/idijBsP/duck_boat_driver_salary.pdfIn PDF document text
    • http://amorexpo.com/nifadijojezinefofusolj8y.pdfIn PDF document text
    • http://alluniversity.fun/828686412411ndlp.pdfIn PDF document text
    • http://gachihyper.xyz/trw_stone_wizard_free_download42b89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383565/normal_5fcbdaaaa25d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416669/normal_5fcfa125c5b11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490529/normal_600e81aaa3b9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417414/normal_5fcaf1ab9ae5c.pdfIn PDF document text
    • http://unosital.space/tabexusedoporopukebejamadqowmc.pdfIn PDF document text
    • http://repair-telefonov.ru/31527525520i1q5w.pdfIn PDF document text
    • http://50offstore.info/super_8_plus_nes_emulatorthrya.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/91ieijC/melaregeguduwetunuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/revipidamog/H0gg5hi/run_meme_sound_1_hour.pdfIn PDF document text
    • http://civiliscmq.online/37089679434sbr2i.pdfIn PDF document text
    • http://boldly-grow.com/fujitsu_digital_annealernl9ol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498678/normal_5fc81cd759c68.pdfIn PDF document text
    • https://cdn.sqhk.co/fosasukenum/jietib5/dune_2000_ps1_review.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/dhivhf6/64538103601.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://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_off00010184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 5024 bytes
SHA-256: a192fa66040b5c05dd94d2fe4f5da11a1c1a5d52bd156c51f9eae920380d1df4
font_01_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 11104 bytes
SHA-256: fd6f09d8b17ae55fc4d3fb815f02bf136e00283b5cfb0d1ea6bb7fa9d0c6a668
font_02_sfnt_off000138a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333