Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca6dbb2b4d57b6d…

MALICIOUS

PDF

81.8 KB Created: 2021-04-29 05:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 11cdfebc02564fa42f0befeade9d0efe SHA-1: ad830b418d5877b92031b2bfdb22160b1848e94e SHA-256: eca6dbb2b4d57b6d5d15a5c62486016902e2fc7e2c99398487b5d7ba24d400c3
192 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the PDF with high confidence. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/strik?utm_term=honda+gx390+service+manual+pdf In PDF document text
    • https://cdn.sqhk.co/jerivudofin/ejcyjb3/82973189529.pdfIn PDF document text
    • http://vknart.xyz/rigikuxamodunipefadasufeyet.pdfIn PDF document text
    • http://smirno.life/vaganewogigizesbqc5g.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/bib5ghx/bewuminimejinisag.pdfIn PDF document text
    • https://cdn.sqhk.co/ralajelisoju/fhcijib/avast_free_antivirus_2019_pc.pdfIn PDF document text
    • http://healingtunes.ru/does_monat_really_buy_you_a_cadillac5fcnc.pdfIn PDF document text
    • http://casserlabs.xyz/plantronics_c053_user_guideobbbh.pdfIn PDF document text
    • http://sovetnik53.ru/pippi_longstocking_originuzuxi.pdfIn PDF document text
    • http://fexuvukenix.22web.org/alliance_x_empire_equipment_guide.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
    • https://s3.amazonaws.com/faluzotixupi/balepapiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d665bae7-69e4-40af-b289-5dc7089923bd/crack_final_cut_pro_x_trial_version_compatibility.pdfIn PDF document text
    • http://jupasugego.rf.gd/74355433093.pdfIn PDF document text
    • http://lasiliroba.epizy.com/zoxozizuvakur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c12bbe3-9614-490c-843e-06e4af292836/4632036352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eba53a2-408a-4ca3-884c-fe4b1d4b6eb5/how_to_successfully_trade_bitcoin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7141bc04-590e-4702-a244-8a28ae4fc006/la_biblia_ilustrada_completa.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/bogoripuzitobobuv.pdfIn PDF document text
    • http://favubilojoko.rf.gd/28838068473.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/what_is_fuel_injection_system_in_bikes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9e479e-fc3e-4070-bb96-4898dbdb51bf/31728586597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e1e813-eb17-4789-86f7-93c4007af82f/webelulubopamunaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/026c78a9-7e26-44f1-87c4-00330968587e/pexifibidusebiburil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 5828 bytes
SHA-256: c79136ff7bcc4d4a3f856faa16738b02fb5af7317f290f321ed1ad9f7de3d396
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 10772 bytes
SHA-256: 059da8a61272c58c8380d9d2a6b17f45f8528347fa56d40cccd0bb8d598e52be
font_02_sfnt_off000129ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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