Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4030fd853d0b4c6…

MALICIOUS

PDF

73.6 KB Created: 2021-05-01 19:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4e0f59bf9b0cc01647df41af2e751889 SHA-1: 24ab9c7f457d7ab7505ef4d423849b0c13b8b4c2 SHA-256: e4030fd853d0b4c68129652646bfe97b15e8bd81241892aa6e1e1baee788dede
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://jacksth.ru/strik?utm_term=the+myth+of+sisyphus+booktopia', suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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=the+myth+of+sisyphus+booktopia PDF link annotation
    • http://limuzinof.ru/17504965379r5nj2.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/jhjjd7N/ferenadeviludiwaferazap.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/zeibYML/somevosewadilosunuzap.pdfIn PDF document text
    • https://cdn.sqhk.co/lutaxudepoje/nhhaIgh/medbridge_education_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/xgjKahf/devil_hunter_eternal_war_classes.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/HFG5gdp/star_wars_premium_pinball_video.pdfIn PDF document text
    • http://everydayy.fun/43236246535upjd5.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/personal_pronouns_british_council.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/8954928082.pdfIn PDF document text
    • http://003-center.ru/whirlpool_wrf535smbm00_ice_maker_stopped_workingl76mp.pdfIn PDF document text
    • http://kitixukizogutik.mygamesonline.org/electronically_sign_on_iphone.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/apc_back_ups_cs_350_manual.pdfIn PDF document text
    • http://wajazenizur.mywebcommunity.org/81126411802.pdfIn PDF document text
    • http://devubowoku.mypressonline.com/pulmonary_edema_in_pregnancy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_23ecf820176a40e9846cbee140dbfee7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a98f1f-1b1c-443f-9ac2-c89b991e9968/what_is_meant_literature_review.pdfIn PDF document text
    • http://kojenixerog.myartsonline.com/national_geographic_magazine_2020_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ff3000-e23f-49a0-9921-94e3147cf3bd/24571031562.pdfIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_89012680c1174408bcbf1443df5e7fb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e4d755-57b1-45fb-959c-16195fb38342/46755891234.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_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 5268 bytes
SHA-256: 4e995413771a5aa4d1cca3c600784597487b4cf45f1311f084831da37a438107
font_01_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 10236 bytes
SHA-256: 5e7196ff81a7c6ea85e2ff7f4622fd13533f7194877c7c9518cecb178c611842

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